Quote:
Originally Posted by JCL
I agree that unfiltered particulates will over time cause wear. More so metallic particles than clutch material, but yes. The question is whether reducing that wear will extend the life of the transmission. If the wear is so slow that the transmission is likely to fail for completely different reasons before the wear becomes critical, there is little point in reducing the wear.
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Statistically speaking, if I owned 1000 transmissions, your strategy might be best. A science if you will.
It seems you've already determined that the wear is,in fact, low- and that the tranny will most likely fail for something other than sludge, particular wear, or lack of lubrication.
But on the off chance that my tranny will not fail for one of the other things you cite, I'll freshen the ATF. Statistically speaking for MY ONE TRANNY it is a superior maintenance strategy.
This is, in fact, an "oil thread" in that nobody has the real answer- all we have are BS marketing materials from BMW and Getrag, and our beliefs.
I propose a two prong plan:
1. Run Used Oil Analsys (UOAs) on virgin ATF, then at 20k, 40k, etc. Compare.
2. Buddy up to a Getrag engineer at Octoberfest, get them to spill their guts.
A