Quote:
Originally Posted by Doru
Fluids have a lifespan. Some longer, some shorter. In the case of front & rear diffs, they can last quite a while, and in Cam's DYI you can see clearly those fluids still looked good.
For the transfer case, that's a different story. Even BMW has a lifespan put on that one, which I believe is around 60-100 K's. And the TIS also specifies the adaptation values of the TC should be reset after changing that fluid. When I changed it last year, while resetting the adaptation values you cloud hear clearly how the TC was doing it's thing.
Same with the Servotronics (if you have the N62) - once off, they have to be reset after installing them back.
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Not saying I don't think the fluids should be changed, I change them even the transmission fluid. I don't see why I would want to replace the OE fluids with a different brand when the original fluid has done a good job and I don't know for sure that other fluids even those I swear by would be better in these applications. Seems to me I have no better than a 50/50 chance that going to another brand is better.