Both OEM Diaqueen & Redline are suprerior lubricants. The difference between one from the other would be personal preference (& price). If it was me I pick the one which costs least. One of my DSM's is filled with Diaqueen & my other is running Redline.

Redline is great for all.

How I'd do it since I have a 99 awd so we're basically the same:

-Change Manual Transaxle fluid every 30000 miles
- 2.3 qt
- (API GL-4 SAE 75W-90 (Red Line MT-90))

-Change Transfer Case fluid every 30000 miles
- 0.55 qt
- (API GL-4 SAE 75W-90 (Red Line Heavy ShockProof))

-Change Rear Differential fluid every 30000 miles
- 0.95 qt
- (API GL-5 SAE 90, 85W-90 or 80W-90 (Red Line Heavy ShockProof))

My personal favorites are:
Motul Gear 300 (Transmission)
Redline 80w140 (Transfer Case & Rear Diff)

For the transmission, I have run everything from diaqueen, redline, synchromesh, lucas, you name it. The one I have had the best results with by far is the diaqueen. The one specifically designed for the Evo 6 speed transmissions. That stuff is gold, and its priced like it too. but its worth every penny.

https://www.jackstransmissions.com/products/mitsubishi-diaqueen-transmission-fluid

From what I have found, it only comes in the gallon container.

Redline is what I have run in everything else. It has managed to keep my dying T-case alive from some time now

Good timing on this post, I'm in the midst of a GST - GSX swap and I was just starting to think about what fluid to use. I was gonna look in the FSM for capacities, but this makes it easy. Thx.

Here are quarts. I bought it by the quart from Jacks also.
https://www.ebay.com/itm/OEM-Mitsub...ash=item1c58bf818e:g:KNoAAOSw~gRV5dMh&vxp=mtr

It's sold in qts most places now

https://www.extremepsi.com/store/product.php?productid=29333&cat=605&page=1

red_devil said:

It's sold in qts most places now

https://www.extremepsi.com/store/product.php?productid=29333&cat=605&page=1

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Use this in transfer car also?

chinola69 said:

Use this in transfer car also?

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No I'd recommend running red line shockproof for the transfer and rear diff.