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post #1 of 5 Old Jul 14th, 2006, 2:59 pm Thread Starter
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Exclamation Mobil One Oil

Which is the best to use in the transmission and rear drive Mobil Synthetic Gear Lub 75W-90 or 75W-140? I had always used 75W-90 but I picked up by mistake 75W-140. Is this OK to use?

Jerry Mathison
Woodbine, Iowa
2008 Gold Wing
2005 Ocean Blue (Sold)
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post #2 of 5 Old Jul 14th, 2006, 3:08 pm
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Yes - That's the same weight as the BMW Syn.

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post #3 of 5 Old Jul 14th, 2006, 6:00 pm
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Don't ya just love the smell of that stuff? The gear oil, that is.

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post #4 of 5 Old Jul 14th, 2006, 6:55 pm
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Smile Oil Specs from Service CD

Interesting question. '99 to '04 CD has 90w for the trans and rear drive. '04 and latter CD has 90w for the trans but 75w140 for the rear drive. Still waiting on an answer from service guy here. As I change both oils way more often than needed, probably not a big deal, but wouldn't the heavier weight have more cushioning effect for a given temp? (gear teeth as opposed to our infamous bearing) From my straw poll, service centres fill both with 80w90.

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post #5 of 5 Old Jul 14th, 2006, 7:56 pm
 
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Page 75 in my 2006 K1200LT manual says Brand-name hypoid gear oil, API class GL 5. and Viscosity class Castrol EPX 90 or SAE 90 API, so I would think the Mobil Synthetic Gear Lube 75W-90 would be the preferred of the two, but I wouldn't sweat it if you had already put the 75W140 in. I searched on this board and it seems alot of riders use it. You might experience a very slight loss of horsepower and gas mileage. I'd change it after 6,000 miles and put in the 75W90. But you might contact BMWNA at Motorcycles 1-800-345-4BMW to make sure.


From Mobil1.com:

Typical Properties

Mobil 1 Synthetic Gear Lubricant LS

SAE Grade 75W-90
Viscosity, ASTM D 445
cSt @ 40C 106
cst @ 100C 15.2
Viscosity Index, ASTM D 2270 150
Pour Point, C, ASTM D 97 -46
Flash Point, C, ASTM D 92 175
[email protected] kg/l, ASTM D 4052 0.859


Typical Properties

Mobil 1 Synthetic Gear Lubricant LS

SAE Grade 75W-140
Viscosity, ASTM D 445
cSt @ 40C 179
cst @ 100C 25.3
Viscosity Index, ASTM D 2270 175
Pour Point, C, ASTM D 97 -51
Flash Point, C, ASTM D 92 221
Density @ 15C kg/l, ASTM D 4052 0.863

Last edited by TimVipond; Jul 14th, 2006 at 8:05 pm.
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