gtr

iTrader: (6)

1. Rear *Hypoid Gear oil 81496030 EX or equivalent. .58qt

2. Transaxle oil * Gear oil API GL4 SAE 75W-85 or 75W90 2.9qt

3. Transfer oil@ Hypoid gear oil API GL-5 SAE90 .58qt

Questions.
1. What is the equivalent for the rear diff?
2. Is it ok to use GL5 since GL4 is so generic and hard to find? They must of specify GL4 for a reason?
3. Is it ok to use 80W90 for the transfer case? Only SAE90?

I'm having a hard time sourcing out the oils since every gear oild is GL5 80/90 or 80/140.

n00dle

iTrader: (4)

1. GL5
2. Only use GL5 in the Rear Diff and Transfer Case
3. Should be ok, but I'd suggest sticking with to factory specs. Whatever GL5 you use in the rear diff make sure it's got LSD additive for the clutch packs or they may wear prematurely. Mail order and you can get the right lubes.

runny_yolk

1. Use GL5 fluid that's formulated for limited slip differentials. The most popular fluids for this seem to be NEO RHD and Redline 75W90.

2. In general, it is NOT good to use GL5 fluid in your manual transaxle. GL5 fluids contain additives that wear out your bearings.

3. You're probably better off using the spec 75W90. If you're really having a hard time locating the right stuff, try calling Redline (www.redlineoil.com), they have a live person answering and can tell you about local retailers in your area.

Check out this thread that I've been writing:
https://www.evolutionm.net/forums/sh...threadid=36221

It's my attempt to document how to do driveline fluid changes.

iodine23

iTrader: (1)

You can also look into Amsoil's products, they have 75W90 and Series 2000 75W90, both of which are GL-5 rated. I put the Series 2000 75W90 in my rear diff after RedLine Lightweight Shockproof started causing clutch chatter (not enough friction modifier). I'm not sure if they make a specific tranny oil like RedLine's MT90/MTL products.

gtr

iTrader: (6)

Just ordered the mitsubishi factory oil for the rear diff and MT90 which fits our appication exactly! Thanks

Now i just need the center diff SAE90. If i can't find strictly 90WT you people think it's ok to use the 80W90 GL-5 oil you find everywhere?

gtr

iTrader: (6)

I just want to update everyone.

The rear *Hypoid Gear oil 81496030 EX or equivalent. .58qt I've ordered from mitsubishi came in today and it says LSD gear oil SAE90 on the can. SO the oil in the rear and the transfer case seems to be one in the same. Would someone please confirm this statement?

This oil should be GL-5 correct??

iodine23

iTrader: (1)

Well the oil in the transfer probably doesn't have the LSD additives that the one in the rear does. The rear diff needs lube with additives.

Chances are that stuff you got is GL-5, yes. There's a post here somewhere (I can't seem to find it now) that lists the weights and GL grades for the three fluids as outlined in the tech manual, not the owner's manual. It goes into more detail into what you want to look for.

EDIT: Duh, found the link. It was on page two of this thread, not page 1.

https://www.evolutionm.net/forums/sh...5&pagenumber=2

gtr

iTrader: (6)

If they are almost one in the same it should be ok to use this oil for the transfer case too I guess the only downfault is that this oil is pretty expensive? You are probably right about the additives but it should be ok?

I've called numberous dealers and the majority of the techs told me they use the same stuff for the transfer case and the trans Personally I feel the evolution is a high performance car for a high performance appilcation so the correct oil is important for wear and performance.

iodine23

iTrader: (1)

Here's a little info on GL specs that might clear some of this up:

http://www.performancempg.com/Drivetrains.htm

From that it appears that GL-5 is "better" in a load-handling sense as compared to GL-4, which is what I always thought. However this can come at the expense of higher friction. So while you can use GL-5 in a GL-4 app, it may contribute to premature wear and excess heat.