Gear Oil Rec. - - Excellence in Motion
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post #1 of 10 (permalink) Old Jul 15th, 2007, 11:46 am Thread Starter
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Question Gear Oil Rec.

Going to go with a synthetic gear oil for my '04 K12GT. What brand are you all using for transmission and final drive?

Thanks for the advice!

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post #2 of 10 (permalink) Old Jul 15th, 2007, 1:02 pm
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I use Mobil 1 75W/90 in my '04KRS, in both trans. and final drive. I have been using Mobil 1 since the 600mi. service, now have 36,500mi. on the machine and no driveline problems.

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post #3 of 10 (permalink) Old Jul 16th, 2007, 8:30 am
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post #4 of 10 (permalink) Old Jul 16th, 2007, 3:24 pm
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Good ole Castrol...........loaded and lubed.........
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post #5 of 10 (permalink) Old Jul 16th, 2007, 4:36 pm
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At the BMW National Rally in West Bend, I attended Paul Glaves' seminar on "not so basic" tech. He emphasized that viscosity is more important than brand in the final drive. Follow the recommendation in the owner's manual, not those of a dealer or an "expert". In the final drive, that means 85W90 lube. He noted that while it is not automatically a causal relationship, all of the bikes with final drive failures had been running out-of-spec lube, mostly 80W140 or the like.
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post #6 of 10 (permalink) Old Jul 16th, 2007, 5:08 pm
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I use the BMW full synthetic stuff, forget the weight, have to look at the bottle when I get home. Roughly the same price as the mobil1 gear oil.
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post #7 of 10 (permalink) Old Jul 16th, 2007, 6:44 pm
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Interesting point about the final-drive failures, too. Especially with the miles Paul and Vonnie put on their bikes.

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post #8 of 10 (permalink) Old Jul 16th, 2007, 7:42 pm Thread Starter
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Thanks for the info. Much appreciated.

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post #9 of 10 (permalink) Old Jul 16th, 2007, 10:18 pm
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Originally Posted by DrMikey
... that viscosity is more important than brand in the final drive...

Viscosity is the single most important aspect to lubrication. It should be the primary selection factor, then consider other additives (friction modifiers, moly, phosphor, etc) based on intended use.

Synthetic should be the last consideration, as dino will work fine as long as it is of the proper viscocity, contains the proper additives for the intended application, and changed at proper intervals. Synthetic's primary benefit is longevity, especially under high temperatures. I do use synthetics as I have been known to run over the recommended change interval by 1,000 miles or so. Synthetics buy me some peace-of-mind when these situations occur.

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post #10 of 10 (permalink) Old Jul 17th, 2007, 6:05 pm
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There is a nice article in the latest issue of BMW ON mag. about this issue. he talks about diff weights and additives.

My current question deals with additives. After reading the article, I am not sure if they would violate a warrentee.

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