Oh absolutely there’s no combustion by-products, but there is expansion and contraction with temperature which despite the best attempts of a gortex breather will always bring in some moisture. Add to that all the spoil from a billion gearshifts and a few missed ones as well as a hypoid final drive, and there’s plenty to befoul a transmission oil volume. I’ve covered more than enough overall sleeves in icky oil to know how bad it can get.....
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