Rear Drive Lube - BMW Luxury Touring Community
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post #1 of 7 Old Jul 17th, 2006, 9:26 pm Thread Starter
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Rear Drive Lube

After someone brought it up on the forum, I took a look at the requirements for gearbox and rear drive oil for my '05 on the maintenance CD. Gearbox SAE90 and rear drive 75W140. I just brought this up as many people say 1 quart of oil will do both. Not on the '05 or '06. I wished someone had told the BMW dealer in Oklahoma City this. They put 90W in both at 6K service. So watch your dealer.

So if BMW changed the spec, would it be a good idea for earlier bikes to run the 75W140? Maybe it's not all the 17 ball bearing change, that might help rear drive failure problems. Just a thought.
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post #2 of 7 Old Jul 18th, 2006, 9:20 am
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Don't worry about it just use the 75W140 synthetic in both. I don't think they changed anything in the gearbox to support the change in oil.

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post #3 of 7 Old Jul 18th, 2006, 10:25 am
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May I suggest this in the rear drive. You will notice an immediate improvement in sound and smoothness. If you dont, you can always take it out.
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post #4 of 7 Old Jul 18th, 2006, 11:23 am
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But for us northerners

My manual called for SAE 90 hypoid gear oil for both the tranny and rear drive. I switched to Mobil1 75W90 synthetic at 12K and never had a problem for 45K miles. (Not much, I know) I just couldn't imagine what 75W140 would be like at 20F. Could you?
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post #5 of 7 Old Jul 18th, 2006, 6:46 pm
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post #6 of 7 Old Jul 18th, 2006, 7:14 pm
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It would be the same Joe. 75W90 and 75W140 have the same viscosity, except one coats like 90 weight and the other coats as if it is 140 weight.

My terminology might be incorrect.

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post #7 of 7 Old Jul 18th, 2006, 7:42 pm
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Smile what the "W" is for

the "w" is for winter weight........
would not get to 140 weight until it warms up and the polymer chains
At 20F this might take a while but not as long as you think.

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