Re: ZF on transmission oil change and lifetime myth
I always thought people understood what happens when you heat ANY petroleum product...the lighter molecules eventually boil off, the same way you boil off diesel, gasoline, kerosene, etc. when distilling crude oil.
The entire time your fluids are being pumped, tiny grains of 'shmutz' (steel, rubber, plastic, etc.) are being worn off edges and lurk in the fluids used to lubricate.
Lifetime anything is pretty much a crock. Can't have mechanisms that do not wear or parts that never fail.
I personally think this was a huge scam put in place for the people who lease or those who buy new cars every year or two...