oil qty front forks - BMW Luxury Touring Community
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post #1 of 10 Old Jun 4th, 2015, 7:57 pm Thread Starter
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Question oil qty front forks

looking for ounces or millileter per fork. my manual says .47 us gallon and i know
that is incorrect.
i got around 14 ounces out
and was thinking of useing 15 weight fork oil becauser i have a new bottle
any reason not to they say atf
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post #2 of 10 Old Jun 4th, 2015, 8:31 pm
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Re: oil qty front forks

I just replaced a fork seal. Each fork takes 0.142 gallons or 0.47 liters. I used ATF.

Bob

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post #3 of 10 Old Jun 4th, 2015, 8:54 pm
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Re: oil qty front forks

The LT forks do not function as a shock absorber so it really does not matter what oil you put in them

Gary
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post #4 of 10 Old Jun 4th, 2015, 11:46 pm
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Re: oil qty front forks

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Originally Posted by gary45 View Post
The LT forks do not function as a shock absorber so it really does not matter what oil you put in them
don't like to disagree with your statement but they do, if you put too heavy oil in them the spring and shock won't work very well. too light and the opposite occurs. to say "it doesnt matter what oil you put in the forks" is a fairly broad statement.

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post #5 of 10 Old Jun 5th, 2015, 12:20 am
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Re: oil qty front forks

I believe he said that because the forks are just empty tubes that keep the front wheels going straight. There is no springs, check valves, orifices, etc. in there, just empty tubes. All the spring support, dampening and basic "suspension" action is handled by the shock/spring that sits back a little bit.
So, all you really need in there is a good oil to keep them moving freely. ATF or other shock oil should be fine, the WT will not change the way the bike handles unless you put something really thick and sticky in there.
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post #6 of 10 Old Jun 5th, 2015, 6:58 am
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Re: oil qty front forks

Quote:
Originally Posted by Axle View Post
don't like to disagree with your statement but they do, if you put too heavy oil in them the spring and shock won't work very well. too light and the opposite occurs. to say "it doesnt matter what oil you put in the forks" is a fairly broad statement.
I agree. I understand his point that this oil is not the primary determinant of damping force as in conventional forks, but different oils will affect both static and dynamic friction of the sliders. A light fork oil will allow much easier fork movement as compared to say heavy motor oil or gear oil. I would stay close to whatever BMW recommends. This is almost always a good idea with any manufactured equipment. It is rare that the maker of the product gets it completely wrong. It happens, but not often and generally gets corrected via a TSB, etc.
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post #7 of 10 Old Jun 5th, 2015, 8:52 am
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Re: oil qty front forks

The 471ML just happens to be 16 FLOZ

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post #8 of 10 Old Jun 5th, 2015, 9:22 am
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Re: oil qty front forks

Quote:
Originally Posted by Axle View Post
don't like to disagree with your statement but they do, if you put too heavy oil in them the spring and shock won't work very well. too light and the opposite occurs. to say "it doesnt matter what oil you put in the forks" is a fairly broad statement.
The stanchions physically touch 2 small bushings that is the bearing surface for movement up and down, as mentioned no springs or damper inside the forks. I am assuming you will not be putting in some type of extremely heavy oil that could affect the small bearing surface and cause increased stiction.
The V Star 650 comes with a very short spring, long 8 inch spacer and they put in quit heavy fork oil, in mine I put in K100 springs, short 1 inch spacer and number 5 fork oil, the ride was much better. The forks worked more fluidly, smoother, they do make an after market spring long spring for the Star, I had the springs from parting out my K100, the stock setup is cheaper.

If you are interested chart on fork oil
Fork Oil Viscosity Chart, ignore the weight on the label.- Mtbr.com

Another tech article on fork oil
http://www.peterverdone.com/wiki/?ti...spension_Fluid

Gary
2018 R1200RT
Past rides
2012 K1600GTL
2000 K1200LT
1992 K1100LT
2000 V Star 650/Velorex sidecar
1985 K100RT
1965 R60/2
1960 AJS 500 single

Last edited by gary45; Jun 5th, 2015 at 10:51 am.
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post #9 of 10 Old Jun 6th, 2015, 9:06 am
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Re: oil qty front forks

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Originally Posted by bob1811 View Post
I just replaced a fork seal. Each fork takes 0.142 gallons or 0.47 liters. I used ATF.
Bob where did you get your fork seals and what kind and order# are they thats the next thing I have to do

Gary
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post #10 of 10 Old Jun 6th, 2015, 10:50 am
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Re: oil qty front forks

Gary,

Two sources the BMW Dealer at $13.00 for each seal plus shipping, or Amazon, "All Balls" fork seal kit #55-108 at $10.88 w/free shipping for two seals. As you might guess, I went with the All Balls deal. They work fine.

Bob

Bob

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