Thomas Guide

A shop that came recommended by this board put Redline MT 90 in my differential this weekend....

Redline says this is not good....

Anyone here use MT 90 in their diff?

B.C.

Do a search on diff, and you'll get of answers to your question.

smirfs2k05

I usally use 75/90 for the differential.

Thomas Guide

Hey BC, actually I have searched and cannot find if this very specific product MT 90 has been used by other S owners for their diff.

I can find other Redline products that are used for diffs, but not this one... (perhaps that answers my question)

B.C.

I think you answered your own question. If you can't find more than 10-15 threads on it, don't use it


All you'll see day and night, is LE607 and Mobil 1.

EvasiveMotorsports

We don't recommend using MT-90 for diff, its more for transmission. It can not withstand the high temperature of the diff.

We use Motul SAE90 or Gear 300.

Vitt

The MT-90 is a GL-4 and should not be used for diff. If you want to use Redline, the correct oil is the 75w90 Gear Oil, which is a GL-5. I am using it right now, and have used it before.

But as BC said, the LE607 replacement is also really good. I used both and had good results with both. The LE is thicker because I believe it is a straight 90W gear oil. Whatever you use, make sure it is a GL-5.

RollerBoy

QuagmireS2k

Can you please post what shop did this. So people know not to go there.

Vitt