once again, you should not use anything but mitsu fluid.

do NOT use "additives" installed in different fluids.
do NOT use different fluids.


I cant say it anymore ways than Ive already said it. Stop questioning it, and use mitsu fluid only.

 

After being on this board and the other one, seems like Transmissions are the #1 issue with the monteros. A majority of the time, problems arise cause somebody stuffed non-approved fluid in the AT. Knowing what I know now, and knowing that Im probably paying too much for the SP-III, Ill use it. Its just too risky to save seriously - $50 - every $30k miles, running another ATF fluid. The truck is just too darn expensive.

With that said, I use non-mitsu lubes (BUT SAME GRADE) in other parts of the drive line. Mobil 1 in the motor, Speciality formulations in the diffs and transfer case - but I make sure they are 5w-30, GL5 and GL4 SAE grades respectively.

Other than blinking 4x4 lights and trannys getting trashed from wrong fluid - these trucks are solid!!!

 

IMHO the tranny's getting trashed from wrong fluid is a stupid owner error, and not a Montero "issue".

 

I use Castrol Import Trans fluid. It is Diamond III acceptable. Been using for 60 K miles now. Changed twice. Trans never shifted better.