Originally Posted by oil_film_movies
The Critic, why did they make that change? I have noticed a lot of gear oils these days call for a light visc automatic tranny fluid. Tesla differentials use thin ATF, and my hybrid about the same stuff, and those are just gear meshing. .... Still, wouldn't hurt to use 75w90, thicker for less wear.
Not sure if that is true... I mean, should I run thicker engine oil for the same reason?
I know my Toyota manual does not like Redline MT-90 (?) in cold weather. Wonderful shifting in hot weather, but just awful when the temps drop below freezing. You can hear the engine bog down letting out the clutch at idle. Their MTL (whatever the thin one is) isn't as good in hot weather but at least it can be shifted when cold. We just live with the crunch that the trans does (it's a low quality unit and has always had problems).
Just how hot does a MT get? I mean, for a brief moment the lube between gear teeth probably gets hot, but overall don't most transmissions stay relatively cool?