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post #1 of 46 Old Feb 9th, 2009, 8:32 am Thread Starter
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Final Drive Lube - 75W140 GL-5 synth ok?

I happened to be at my local dealer Saturday for a state safety inspection and thought it would be good to pick up some final drive lube, as mine hasn't been changed in about 8k miles.

I didnt know the spec offhand for it, so I asked at the parts counter. They hooked me up with a BMW branded gear oil: 75W140 GL-5 full synthetic.

Got home & looked at my Clymer shop manual & the spec is for SAE 90 GL-5.

I'm thinking I'd be ok to use this, as its GL-5 lube, just multi vis instead of a straight 90 weight.

Is this to right stuff to use?

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post #2 of 46 Old Feb 9th, 2009, 8:43 am
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by Silverhair
I happened to be at my local dealer Saturday for a state safety inspection and thought it would be good to pick up some final drive lube, as mine hasn't been changed in about 8k miles.

I didnt know the spec offhand for it, so I asked at the parts counter. They hooked me up with a BMW branded gear oil: 75W140 GL-5 full synthetic.

Got home & looked at my Clymer shop manual & the spec is for SAE 90 GL-5.

I'm thinking I'd be ok to use this, as its GL-5 lube, just multi vis instead of a straight 90 weight.

Is this to right stuff to use?
I use 75-140 in the Tranny. 80-90 in the FD Both Synth, both are the much hated product on this site, Amsoil.

Others will chime in. I just would stay as close to spec as possible for viscosity. Especially in the FD.

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post #3 of 46 Old Feb 9th, 2009, 9:32 am
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

75w-90 Mobil 1

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post #4 of 46 Old Feb 9th, 2009, 10:00 am
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Re: Final Drive Lube - 75W140 GL-5 synth ok?


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post #5 of 46 Old Feb 9th, 2009, 10:02 am Thread Starter
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Interesting...

I wonder why they gave me this (75W140 GL5)?

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post #6 of 46 Old Feb 9th, 2009, 10:16 am
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

75/140 synthetic works for both the transmission and the final drive.
I have used both Mobil 1 and BMW (branded) oil.

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post #7 of 46 Old Feb 9th, 2009, 11:00 am
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by LAF
I use 75-140 in the Tranny. 80-90 in the FD Both Synth, both are the much hated product on this site, Amsoil.
I used Amsoil in my final drive for over 60,000 miles and it never blew up.. I take that as proof positive that Amsoil did not make my final drive blow up.

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post #8 of 46 Old Feb 9th, 2009, 11:12 am
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by zippy_gg
75/140 synthetic works for both the transmission and the final drive.
I have used both Mobil 1 and BMW (branded) oil.
This what I've run in both of my LT's.

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post #9 of 46 Old Feb 9th, 2009, 12:33 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by Road_King
75w-90 Mobil 1
Would be my Second Choice for sure!!!

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post #10 of 46 Old Feb 9th, 2009, 1:38 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

I have been using Red Line Synthetic "Shockproof" Heavy lubricants in my LT as well as the other bikes I own now for quite a while. It makes the transmission quieter and it shifts smoother. I started using it in the LT after the first final drive failure, I was searching for something that offered better protection and this oil seemed to be the best one. The most notable difference however is in my Harley transmission, it makes an astonishing difference there, we all have heard how they clunk when put into gear from neutral and how they clunk each time you shift, with Red Line it has been SIGNIFICANTLY quieter and is much smoother shifting.
At normal drain intervals I have not seen any discoloration of the lube and even the "fuzz" that normally is present on the drain plug magnet has disappeared. Of course there are no guarantees that you might have the same results but it has proven it's worth to me.


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post #11 of 46 Old Feb 9th, 2009, 2:04 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Valvoline 75W140 full Synthetic here for over 40,000 miles with no problemos I use it in both trans and FD.

Stevie Shreeve
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post #12 of 46 Old Feb 9th, 2009, 2:16 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

I wrote to Paul Glaves and he maintains that anything heavier than 80-90 in the final drive is out of specs. In fact, he believes that many final drive failures are due to using wide range viscosity gear oils.

He also suggested that one add 3% molyldenum disulfide to the final drive oil when changing it. I use Dow Corning Gear M, which is a little hard to find, but Motion Industries carries it. Moto Guzzi requires the use of M D in their final drives.

I change the FD about every 3-6 thousand miles and use Lucas 80-90 gear oil with Dow Gear M. Glaves told me he has over 500 thousand miles on Beemers and has never had a FD failure using this method.

It does make sense, because molyldenum disulfide is used in heavy machinery applications where gears are subjected to high pressures and stress.

Anyway that is my story and I am sticking to it.
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post #13 of 46 Old Feb 9th, 2009, 2:39 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
M. Glaves told me he has over 500 thousand miles on Beemers and has never had a FD failure using this method.
reading "between the lines" that tells me that chances are the "majority" of his miles were put on "airheads"
the final drive issues only surfaced in bikes built in the last ten years.

I had a final drive failure 10K into the ownership of my first LT using Mobil I 75/140,
using that kind of logic, "it must have been the oil" huh?
So why am I still using the same oil?

Because that was not the problem,
it was a bad bearing, just like all the other "bad bearings" that failed.

Regardless of brand name, oil is oil, there is no "magic" fluid.


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post #14 of 46 Old Feb 9th, 2009, 2:40 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by hoog62
I used Amsoil in my final drive for over 60,000 miles and it never blew up.. I take that as proof positive that Amsoil did not make my final drive blow up.
And what was your first clue?

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post #15 of 46 Old Feb 9th, 2009, 3:01 pm
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Cool Re: Final Drive Lube - 75W140 GL-5 synth ok?

Been using the same 75W140 for over 80K now without any repeats of my one failure, so i really don't think it was due to the oil! I have used Castrol Syntec and Mobil 1 in the same grade synthetic previously with no probs either.

John
Quote:
Originally Posted by zippy_gg
75/140 synthetic works for both the transmission and the final drive.
I have used both Mobil 1 and BMW (branded) oil.

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post #16 of 46 Old Feb 9th, 2009, 3:11 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by SilverBuffalo
reading "between the lines" that tells me that chances are the "majority" of his miles were put on "airheads"
the final drive issues only surfaced in bikes built in the last ten years.

I had a final drive failure 10K into the ownership of my first LT using Mobil I 75/140,
using that kind of logic, "it must have been the oil" huh?
So why am I still using the same oil?

Because that was not the problem,
it was a bad bearing, just like all the other "bad bearings" that failed.

Regardless of brand name, oil is oil, there is no "magic" fluid.
I agree there is no magic oil, but to use a multi grade, which is not approved by the manufacturer of the motorcycle is basically asking for a problem. In addition, most BMW final drive failures involve pitting and chipping of the bearing face, which leads to race failure. Molyldenum disulfide has been used for years in heavy service applications to minimize bearing and gear failure.

I suspect that is the reason that Moto Guzzi requires its use in their final drives. However, this is only a suggestion, use what you want.
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post #17 of 46 Old Feb 9th, 2009, 4:51 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by pendie
And what was your first clue?
No flies on me.....YMMV

I love oil/lube threads.

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post #18 of 46 Old Feb 9th, 2009, 5:13 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

[QUOTE=SilverBuffalo]reading "between the lines" that tells me that chances are the "majority" of his miles were put on "airheads"
the final drive issues only surfaced in bikes built in the last ten years.

QUOTE]

you need to do a little research before popping off with an unsupported and unsupportable opinion.

paul glaves is well known to friends of the marque - for example as a multi-year tech editor of the MOA mag. the largest majority of his miles were on classic K bikes - one k75 in particular - and on oilheads. lately, he has been doing adventure touring on f650s chain-drivers. the classic ks and the oilheads have exactly the same final drive design and construction as the LT.

if paul EVER had an airhead i am not aware of it.

he is an expert BMW mechanic with a degree in mechanical engineering, so his opinion is well supported by both education and hands-on experience.

although BMW does sell the wide range multi-grade oils, i have seen enough cases of damage where the wide range oils were used to be convinced. i also have seen better shifing performance with the boxes that use the light grade oils so that i shifted my own back to the 75-90 mobil one, and have not been sorry i did.

although it is possible that the 75-140 provides additional protection is very limited circumstances - for example after 350 miles in a single session - in most normal uses i have concluded that the negatives - slow warm up and poor flow when cold - sticky shifting - are simply not worth the price.

YMMV.

g.

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post #19 of 46 Old Feb 9th, 2009, 5:50 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

I contend the FD performance and life variations with different oils are trivial, compared to the variations in assembled FD bearing preloads.

Spalling indicates a metal fatigue problem, not a lubrication problem.
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post #20 of 46 Old Feb 9th, 2009, 7:59 pm Thread Starter
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Earlier, I wondered why they just didnt give me the SAE 90 weight at the counter...

After digging in my files for my 24k service receipt (last May), I think I know why.

I see they billed me for 1.25 quarts of 75W140 synth gear oil (trans & FD I imagine, as the FD is only supposed to need a smidge more that 200 ml). So I guess my dealer's service department is using BMW synthetec 75W140 for both transmission & final drive lube jobs.

Just to be clear, this is a BMW dealer. So if that's the case, shouldn't this be the new standard?

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post #21 of 46 Old Feb 9th, 2009, 8:25 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by Silverhair
Earlier, I wondered why they just didnt give me the SAE 90 weight at the counter...

After digging in my files for my 24k service receipt (last May), I think I know why.

I see they billed me for 1.25 quarts of 75W140 synth gear oil (trans & FD I imagine, as the FD is only supposed to need a smidge more that 200 ml). So I guess my dealer's service department is using BMW synthetec 75W140 for both transmission & final drive lube jobs.

Just to be clear, this is a BMW dealer. So if that's the case, shouldn't this be the new standard?
I do not think ANY dealer should change what the specified lubrications should be according to the manufacturer. As long as they hold your Warranty do what they recommend though.

Look in the BMW Service CD. The specified fluids are listed there.

Again your bike, use what you want.

Lee
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post #22 of 46 Old Feb 9th, 2009, 8:26 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by Silverhair
Earlier, I wondered why they just didnt give me the SAE 90 weight at the counter...

After digging in my files for my 24k service receipt (last May), I think I know why.

I see they billed me for 1.25 quarts of 75W140 synth gear oil (trans & FD I imagine, as the FD is only supposed to need a smidge more that 200 ml). So I guess my dealer's service department is using BMW synthetec 75W140 for both transmission & final drive lube jobs.

Just to be clear, this is a BMW dealer. So if that's the case, shouldn't this be the new standard?
Ed, I don't have a thought as to why they billed you for more lube than is required. A '99 xmission and FD takes the following:

tranny --- .63 qts.
fdrive --- .24 qts.

I guess it's possible to put in 11.2 more ounces of lube than spec'd, butt I've never been able to, using the manual guidelines (fill to the bottom of the filler hole threads). And for what it's worth, ole Toad (a '99) has guzzled Amsoil 80W90 synth starting about 100K miles ago.
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post #23 of 46 Old Feb 9th, 2009, 9:00 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

I will invest in a quart of this stuff. Sounds like just what the FD is calling out for.


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post #24 of 46 Old Feb 9th, 2009, 9:00 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by walkingdude
I agree there is no magic oil, but to use a multi grade,
which is not approved by the manufacturer
of the motorcycle is basically asking for a problem.
Ahh come on dude, not approved by the manufacturer means that the rep from that oil company
hasn't taken the rep that writes the specs out for a game of golf and dinner yet.

The last eight years I was still "gainfully employed" (its been a while) I worked with oil manufacturers
and oil analysis was one of my daily tasks,
Believe me when I tell you "that's how things are done".

If you think Moly is the "magic ingredient", use it, (but only if its approved by BMW)
still there are no guarantees.
Quote:
Originally Posted by hoog62
I love oil/lube threads.
yup, me too.
Quote:
Originally Posted by hmmmm90s
you need to do a little research before popping off with an unsupported and unsupportable opinion
geesh maybe you can tell me then, does Paul wears boxers or briefs?

I've met Paul and Voni and Oak and Joe Katz and....etc .... many of the other old time Guru's
back when I used to be a "rally rat"

I was there when Voni showed up at the rally on her first K-bike.
I was even around before she was "the Lady in Red"

I don't expect you to remember all that, you were probably still in diapers


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post #25 of 46 Old Feb 9th, 2009, 9:24 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Been using 75w140 in the tranny and FD for 12 miles. Before that 85w140 for 12K miles. Just purchased 75w90 synthetic and will use that in the tranny at the 36K mile service in 2K miles.

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post #26 of 46 Old Feb 9th, 2009, 9:31 pm Thread Starter
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

You know, this stuff aint cheap... I paid $22.50 for this stuff!

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post #27 of 46 Old Feb 9th, 2009, 10:19 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

$22.50 for a quart of gear oil? OUCH!! I paid $14.00 OTD for the 75w90 from a local Land Rover dealer.

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post #28 of 46 Old Feb 9th, 2009, 10:27 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by SilverBuffalo
reading "between the lines" that tells me that chances are the "majority" of his miles were put on "airheads"
the final drive issues only surfaced in bikes built in the last ten years.

I had a final drive failure 10K into the ownership of my first LT using Mobil I 75/140,
using that kind of logic, "it must have been the oil" huh?
So why am I still using the same oil?

Because that was not the problem,
it was a bad bearing, just like all the other "bad bearings" that failed.

Regardless of brand name, oil is oil, there is no "magic" fluid.
I think Paul has been on K Bikes for a lonnngg while...sorry Paul He is one of the gurus on level with Bian Curry, Don Eilenberger, Don Hamblin, Rob Lentini...K-Bike Gods All.

+1 on the Red Line. It also makes for a good cologne

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post #29 of 46 Old Feb 10th, 2009, 2:43 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

The 2004+ BMW Service Manual CDROM, states Castrol MTX 75w140 lube is used as initial factor fill. I confirmed this with an oil analysis at my first change on my "06.

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post #30 of 46 Old Feb 10th, 2009, 7:08 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by SilverBuffalo
reading "between the lines" that tells me that chances are the "majority" of his miles were put on "airheads"
the final drive issues only surfaced in bikes built in the last ten years.

I had a final drive failure 10K into the ownership of my first LT using Mobil I 75/140,
using that kind of logic, "it must have been the oil" huh?
So why am I still using the same oil?

Because that was not the problem,
it was a bad bearing, just like all the other "bad bearings" that failed.

Regardless of brand name, oil is oil, there is no "magic" fluid.
Nope. Paul put 370,000 miles on one K-bike, and I know he owned other K-bikes.
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post #31 of 46 Old Feb 10th, 2009, 8:28 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

I used Amsoil in my final drive for over 60,000 miles and it never blew up.. I take that as proof positive that Amsoil did not make my final drive blow up.

There are no elephants in Central Oregon. I take that as proof positive that the elephant repellant I wear is working!!!
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post #32 of 46 Old Feb 10th, 2009, 8:33 pm Thread Starter
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Thanks for the word Realwing - very interesting that there may have been a spec change.

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post #33 of 46 Old Feb 10th, 2009, 11:03 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

[QUOTE=keith1]Been using 75w140 in the tranny and FD for 12 miles. QUOTE]

Wow, that shortened maintenance scheduled must have elevated the operating costs by quite a bit
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post #34 of 46 Old Feb 10th, 2009, 11:48 pm
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Angry Re: Final Drive Lube - 75W140 GL-5 synth ok?

There only 1 good reason for using an oil that is not specified by BMW - nothing else is temporarily available. My LT should have 75-90 synthetic in it and the dealer has been putting in 75-140, because they do not know any better (final drive). We are not happy!!
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post #35 of 46 Old Feb 11th, 2009, 12:32 am
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Realwing - My 2005 LT calls for Castrol SAF XO, and that is 75-90 synthetic. I cannot find any support for 75-140 from BMW even though some dealers are using it. My dealer is so far unable to show me why.
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post #36 of 46 Old Feb 11th, 2009, 2:01 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by hwread

Nope. Paul put 370,000 miles on one K-bike, and I know he owned other K-bikes.
Wow, that's impressive,

in that case I stand corrected in my unsupported/unsupportable (i liked that) allegation.
I do remember him on an airhead, but I've been out of "the loop" for quite a while,
I guess that makes me an "old fart"


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post #37 of 46 Old Feb 11th, 2009, 3:03 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by SilverBuffalo
Wow, that's impressive,

in that case I stand corrected in my unsupported/unsupportable (i liked that) allegation.
I do remember him on an airhead, but I've been out of "the loop" for quite a while,
I guess that makes me an "old fart"
Not to worry, I reached the stage of an old fart sometime ago. I have since learned to deal with it. It really is'nt so bad, until you meet someone you know and can't remember their first name. It is that pathetic look they give you that hurts. Oh well, as long as I can ride my bike, I will be ok.
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post #38 of 46 Old Feb 11th, 2009, 4:35 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

I've been using ****** 80/90 in both my tranny and FD. My FD went kerbloowie at 45k. I doubt it was the oil that caused it and I doubt the oil kept it running longer than another brand or weight. Having talked to a number of techs and a dealer I respect I've come to the conclusion that it is a crap design crappily executed. I change the FD at every oil change, no reason to worry about what I can't control.

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post #39 of 46 Old Feb 11th, 2009, 9:27 pm
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Thumbs up Re: Final Drive Lube - 75W140 GL-5 synth ok?

+1 Tim! I couldn't agree more! Mine went at around 42K also.

John
Quote:
Originally Posted by treed
I've been using ****** 80/90 in both my tranny and FD. My FD went kerbloowie at 45k. I doubt it was the oil that caused it and I doubt the oil kept it running longer than another brand or weight. Having talked to a number of techs and a dealer I respect I've come to the conclusion that it is a crap design crappily executed. I change the FD at every oil change, no reason to worry about what I can't control.

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post #40 of 46 Old Feb 11th, 2009, 9:31 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by treed
I've been using ****** 80/90 in both my tranny and FD. My FD went kerbloowie at 45k. I doubt it was the oil that caused it and I doubt the oil kept it running longer than another brand or weight. Having talked to a number of techs and a dealer I respect I've come to the conclusion that it is a crap design crappily executed. I change the FD at every oil change, no reason to worry about what I can't control.
That must get expensive changing the FD at every oil change!!

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post #41 of 46 Old Feb 11th, 2009, 11:12 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by walkingdude
I wrote to Paul Glaves and he maintains that anything heavier than 80-90 in the final drive is out of specs. In fact, he believes that many final drive failures are due to using wide range viscosity gear oils.

He also suggested that one add 3% molyldenum disulfide to the final drive oil when changing it. I use Dow Corning Gear M, which is a little hard to find, but Motion Industries carries it. Moto Guzzi requires the use of M D in their final drives.

I change the FD about every 3-6 thousand miles and use Lucas 80-90 gear oil with Dow Gear M. Glaves told me he has over 500 thousand miles on Beemers and has never had a FD failure using this method.

It does make sense, because molyldenum disulfide is used in heavy machinery applications where gears are subjected to high pressures and stress.

Anyway that is my story and I am sticking to it.

I read Paul's very insightful, and well written, article in the MOA magazine a few months ago. The thing that impressed me with Paul was that he didn't tout synth or dino oil over the other. His mantra has been to use the "proper viscosity" when you change your oil regardless of what base oil you use. Seems reasonable to me. I don't see anyone using 10W90 in their crankcase, so why would anyone use gear oil that's much too heavy for the final drive? The Germans who engineered the thing, the tech writers who wrote the manuals, and my local technician who services my bike all say use GL-5 or 75W90 so that's what I do. 80K on the oilhead RT and 73K on the KLT with no problems so far. A lot of those miles have been two up and heavily (over)loaded.

YMMV.
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post #42 of 46 Old Feb 11th, 2009, 11:42 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

I'd be curious to know if and how ANYONE scientifically determined exactly what oil/viscosity should be used where. I don't know about BMW, but does anyone really believe that Ford, GMC, Chrysler etc has any tribologist or lubrication specialist on staff testing engines, transmissions or differentials for the exact viscosity? Or do you think that perhaps the CAFE standards dictates the oil used? And I wonder how often XX weight oil is used because "that's what we've always used before". How many of us trust the oil we use (and be honest here) because "that's what my dad used to use". I doubt seriously that the recommendation of a 0-30 in any engine has squat to do with engine life vs. federal government mileage regulations. I feel more comfortable learning the properties of lubricants and the application to which they're used, then deciding which I'll use, rather than trust, what was the phrase (?) some tech writer!

NOW, my mind is made up - DO NOT confuse me with facts!!!
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post #43 of 46 Old Feb 12th, 2009, 8:28 am
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by pushin9s
I read Paul's very insightful, and well written, article in the MOA magazine a few months ago. The thing that impressed me with Paul was that he didn't tout synth or dino oil over the other. His mantra has been to use the "proper viscosity" when you change your oil regardless of what base oil you use. Seems reasonable to me. I don't see anyone using 10W90 in their crankcase, so why would anyone use gear oil that's much too heavy for the final drive? The Germans who engineered the thing, the tech writers who wrote the manuals, and my local technician who services my bike all say use GL-5 or 75W90 so that's what I do. 80K on the oilhead RT and 73K on the KLT with no problems so far. A lot of those miles have been two up and heavily (over)loaded.

YMMV.
I agree 100% with your statement.

This all started with Viscosity. Not a dino synth question.

As I said I will stick with the Viscosity that BMW says should be in there.

Others do what you like, your bike, your money.

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post #44 of 46 Old Feb 12th, 2009, 12:08 pm Thread Starter
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

The lubricant I purchased IS 75W140. Its ALSO GL-5.

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post #45 of 46 Old Feb 13th, 2009, 3:47 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by fpmlt
I'd be curious to know if and how ANYONE scientifically determined exactly what oil/viscosity should be used where. I don't know about BMW, but does anyone really believe that Ford, GMC, Chrysler etc has any tribologist or lubrication specialist on staff testing engines, transmissions or differentials for the exact viscosity? Or do you think that perhaps the CAFE standards dictates the oil used? And I wonder how often XX weight oil is used because "that's what we've always used before". How many of us trust the oil we use (and be honest here) because "that's what my dad used to use". I doubt seriously that the recommendation of a 0-30 in any engine has squat to do with engine life vs. federal government mileage regulations. I feel more comfortable learning the properties of lubricants and the application to which they're used, then deciding which I'll use, rather than trust, what was the phrase (?) some tech writer!

NOW, my mind is made up - DO NOT confuse me with facts!!!
I did some engineering calcs last year using the SKF specified lubrication requirements for the deep groove ball bearing in the rear drive.(the one that fails) It showed that 75w90 or 80w90 had a significant lubrication margin for this bearing, thus 75w140 has even more margin.
Having said that - I cant explain why BMW uses 75w140 as the factory fill, unless they wanted a large margin for break-in.

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post #46 of 46 Old Feb 13th, 2009, 5:01 pm
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Re: Final Drive Lube - 75W140 GL-5 synth ok?

Quote:
Originally Posted by RealWing
I cant explain why BMW uses 75w140 as the factory fill, unless they wanted a large margin for break-in.
It could be actual operating temperature related. It doesn't take that much higher temps for 75/140 to reach the same low SUS viscosity as 75/90. I can't find the charts right now but maybe their concern was operation in our great Southwest? They may not know either............
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