Quote:
Originally Posted by j3rf
I have been reading threads on that recently and thought it was something about metal deactivators in the Motul making in GL-4/5 compatible. Don't know I believe it myself as I haven't decided what to put in my transmission.
|
Quote:
Originally Posted by strat61caster
The differential specs GL-5 and Motul Gear 300 satisfies GL-4/5, technically it's not supposed to be in the transmission according to the manual and I can't recall what made the majority of the community agree it was ok...
|
I assume the problem is that people assume transmission lube is the same as hypoid gear lube because they both have gears in them, but it isn't. Specifically, the GL 4 and 5 rating is applicable for hypoid gear use only, which is what's used in differentials and transaxles...it's a meaningless rating for our transmissions, other than indicating whether it would be corrosive to soft metals. Adding confusion to the whole issue is that the rating scale for transmission oil weights and engine oil weights are not the same, even though they are expressed in a similar format (such as 10W-40 or 75W-90). In reality, a 10W-30 engine oil is roughly equivalent to a 75W-90 transmission oil in weight.