Has anyone ever used the Mobil 1 75W90 GL5 for their driveline fluids? The bottle states that it meets API GL5, exceeds 75w90 (tranny fluid). I used it on my tranny and transfer case. Did not get enough for rear diff. But if anyone uses it or has any expertise on it let me know before I go shredding the snow!!!!!

 

Good luck with that. It might be ok in your Trans but I would get that out of your TC ASAP if not youll be paying for a new one

 

The tranny calls for GL-4 and the tcase and diffs call for GL-5 so I dont know how well it will work with the tranny. Also in my limited experience with transfercases and hundreds of hours of reading, I would only use diaqueen in my tcase and rear diff just to be on the safe side. Some fluids classified as GL-5 dont actually protect well enough for the tcase and can cause issues down the line.

 

Take it out of the transfer case.....It cost me one in less then 2000mls..

 

Ill second that, but I normally stay out of these discussions because Im slightly partial to Diaqueen.

 

redline baby...

 

so i am getting frustrated trying to find an equivalent fluid for the transfer case and rear dif. what is equivalent for the stock fluid that is sold in stores? All I find in the auto stores are GL-5 75W90 and that is all. So any help would be great.

 

There is no GL-4 out in the stores all they sell is GL-5 75WW90 or higher, even the non-synthetic fluids.

 

You need to plan ahead and order the fluid you need next time. Like you said the stores only carry limited variety of lubes. I started using AMSOIL about 1k miles ago on my trans,tc and rear diff and everything seem to be just fine, except the 1-2 shift got notchy and grinds sometimes. I used to get locked out in 1st and reverse but those went away but replaced with the 1-2 shift issue. There's a lot of brands out there, it's really just what you choose. Replace that Mobil 1 asap! with OEM or AMSOIL.

 

I have always read about alot of problems with anything other than stock fluids.

 

The one place where I would not worry about using Mobil gear oil is the rear diff. The rear diff should work fine with any of the gear lubes on the market.

 

Then I would suggest you buy it online. Some fluids are rated for GL-4 and GL-5 but I wouldnt trust that in the finicky parts of the evo. I personally use Redline MT90 which is a GL-4 fluid I bought online and it has been working great. Most autoparts stores, unless its a specialty store sell a limited selection of fluids.

 

For my tranny, i put in 2 qts of Redline MT-90 and 1 at MTL. That puts me in between 75W80 and 75W90 viscosity level. I noticed that they do take a bit longer to warm up than OEM fluid. It's hard to get in second when the car is cold. Maybe it's the viscosity level since OEM uses 75W85. I don't know if any of you guys feel the same.

 

What about amsoil?

 

i was told that you have to let the car warm up a bit longer because the amsoil trans fluid doesn't have any special additives. Have you tried this out yet? I was going to pick the amsoil tranny fluid