Originally Posted by golgo13

Transfercase: Mitsubishi OEM GL5 LSD Gear Oil Diaqueen (Part #3775610) If you run anything other than OEM in your transfercase, you'll be replacing it.

Rear Diff: Redline 80W140 GL-5 Gear Oil is highly recommended, but you can also use Mitsubishi OEM GL5 LSD. That's what Mitsubishi recommends.

Transmission: If you have a 5 speed use Redline MT-85.

Originally Posted by hatakashi

I have a 6-speed, so should I use GL-4?

Originally Posted by golgo13

Yep!

75W85 GL-4

Originally Posted by jemm

For the AYC Hydraulic fluid contained in the boot resovoir

Checking the levels :

1. Inspect the fluid with a syringe, draw out some and place it in a clear glass container or test tube is it VERY dirty? If so have it replaced (see #4)

2. Stop the vehicle, leave it for 90mins to allow the levels to rise (i.e. for the ayc accumulator pressure to drop),

3. If AFTER 90 mins, the levels are less than the minimum add some Mitsubishi ATF - SPIII to top it up.

4. Drawing out the fluid with a syringe and replacing makes no sense as you will not be getting rid of most of the fluid in the pump system, go to your dealer and have them flush through some new fluid with the aid of the Mut -II/III diagnostic computer or the very secret manual technique.


You don't need to bleed your ayc hydraulic system unless the fluid is dirty beyond belief or one has done work on the pump / hoses etc. Do not believe the hype, you don't have to do it every 4500Kms. This bleeding the ayc hydralic system ever 4500 has never been posted in any service manual or bulletin .... its a $$ making scheme by those UK dealers if you ask me...

here is a sample of my ATF after 18,000KMs .... crystal clear (i know i can't take photos... but you get the idea ) :

Originally Posted by jemm

Now here is where it gets hard. I say HARD because unless you have the small hands and patience of Baby Jesus, getting access to the AYC Fill plug on the 7 & 8 is very hard..... *it will cause you to cuss *

The fill hole is a 17mm plug located high on top of the diff, this area is blocked by the rear diff crossmember..

Test to see if you can pull the fill plug and refit it, if not then DO NOT pull the drain plug, take it to the dealer and have them do it

Fluid :

Evo 7 : 0.7 L
Evo 8 : 0.55 L

of Mitsu ATF-spIII (this is the same fluid that mitsu uses in their Auto trannies of all their cars, so you should be able to get it at the dealer). Although some people use Honda power steering fluid or AMSOIL ATF in place of the SPIII, I would stick to the Mitsu fluid as its cheap and readily available at any mitsu dealership.

The purpose of the this fluid is to bathe the clutch packs (ayc uses a wet clutch system) and so prevent premature clutch wear. THIS IS THE MOST IMPORTANT PART OF AYC MAINTENANCE.
There is some controversy as to what is the official service interval. With hard use change it every 5000miles, otherwise every 18,000. In the early days of the Evo 4, when some of them had faulty ayc ECUs that fried the clutches, increased the service interval to 4500. With the new generation of ayc cars, it is said that will increase the interval to 18k. I change it @ 15,000Kms to be safe!

Originally Posted by golgo13

Transmission: If you have a 5 speed use Redline MT-85.

Originally Posted by llDemonll

I'm guessing you run this, if so how did it feel compared to OEM?

Have you tried the "cocktail" mix at all from redline?

Originally Posted by golgo13

I assume you're talking about this?

http://www.maperformance.com/redline...smissions.html



I have not tried that fluid, no. I went from OEM to MT-85.

Kracka has confirmed in other threads that Redline released this product to replace the cocktail mix evo VIII/IX guys are running in their 5 speeds. He has also said that it's been met with mixed results. Some have better results with the cocktail and others with the MT-85.

For my track evo, I run the MT-85 and it works like a champ. The transmission shifts smooth when cold and great at high operating temps.

You're going to have to try either and see what your car prefers if you're considering switching from OEM.

Originally Posted by hatakashi

Can't believe it...the Mitsubishi Main Dealer in HK doesn't stock ANY Diaqueen oil, except AYC

Originally Posted by golgo13

Interesting. I'm curious... what do they recommend? If they don't have OEM stuff, what the hell are they going to try and sell you?

Maybe you can get it directly straight from Japan?

HK isn't too far... ~2000 Km