Quote:
Originally Posted by ard
I wonder if the average lifespan would increase if we had an ATF change at say 40k intervals?
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I don't know. I wish we could prove that, but I don't think we can. It seems like there are way too many failures of low mileage transmissions for me to think the fluid is a real concern. To me, the people with over 150k on original auto transmissions (new fluid or original) are lucky because BMW automatic transmissions seem to be problematic from very low mileage. Even before 40k miles. I do see your point though, but how do we know if the same thing that failed on the low mileage trans is not the same reason that one failed at 125k? Regardless of fluid condition? Also, will the new fluids additional benefits (if any) be worth any risk of changing it?
I am no expert, but aren't most of the trans failures (low or high mileage) related to items not necessary affected by fluid, or atleast not due to worn fluid no longer capable of doing it's job?
Has anyone here who has experienced a trans failure for any reason had the transmission professionally analyzed? Would be interesting to see the results from a few failed transmissions with and without fluid changes.