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Old 08-27-2003, 11:52 AM   #10
Scooby Specialist
Member#: 30727
Join Date: Dec 2002
Chapter/Region: South East
Location: Orlando, FL
2000 Legacy B4 RSK
*Formerly subyluvr2212*


Here is the final word on gear oils in Subaru manual transmissions...

Of course my Legacy has over 120k and choosing gear oils gets touchy at that mileage...

Synthetic is simply too slick. There is not enough friction between the synchro cones to allow the gears to engage properly when synthetic oil is used.

I tried Redline 75W90NS for a while, was grinding gears left and right, so upon suggestion, as mentioned before, I used Redline MT-90 (GL4) and 75W90NS, half and half. It pretty much solved the problem.

But after a bad axle seal leak developed on the car, and having to put whatever gear oil I could get in the tranny to keep it full, I got the leak fixed and had some 6 different types of gear oil in the tranny.

I changed the gear oil one last time, putting straight Castrol dino oil in it, and have not ground a gear since...

Regular dino oil is the best for Subaru manual transmissions.
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DerFahrer is offline   Reply With Quote