[2SS Capt]

Originally Posted by UnknownJinX

Maybe the dude looked at the transmission fluid specs somehow? Even then, V8 M6 and A10 use different types of ATF (Dexron III for M6, Dexron VI for A10).

Either way, that's a very amateur mistake and I would be very curious where they saw that info.

I am with arpad that you should really check the fluid specs for any fluids. Coolants especially can be a lot of fun.



I don't know if the viscosity that's gonna do OP's differential in here, especially for a street-driven vehicle. I think it's the additive package (or should I say the lack of correct additives) that's wreaking havoc on the clutches inside the LSD, hence the noise.

And yeah 75W-90 diff fluid is pretty thick when cold, though gear oil viscosity index is actually different from the engine oil viscosity index. Took me forever to pour some into the manual trans on my winter car Mazda3 yesterday. 75W-90 gear oil is similar to 5W-30 engine oil in viscosity IIRC.

Meh.... I'd say 75W-90 is a LOT thicker than 5W-30 (unless the 5W-30 was in a freezer for a VERY LONG while...) All of my other (4) cars run 5W-20, which looks like typical motor oil, the 75W-90 I put in my rear diff was QUITE thick compared to that... Any ATF I have ever poured has been thinner or at most, the thickness of 5W-20... 75W-90 is FAR thicker... I'd be very concerned...