This topic has been hashed over so much on the old USMB it isn’t funny. I don’t know if any of those threads made it over to the new board, but I feel differently than most on this topic.
I refuse to use Redline, or any synthetic gear oil, in my Subaru MT’s. I switched my Legacy over to Valvoline partial synth GL5 about 2 years ago. It drove peachy for a few months, then I would start grinding 4th a bit. Per someone’s suggestion, I tried Redline 75W90NS GL5 in the tranny. Immediately, I was not able to shift into 4th without grinding unless I double-clutched. So I tried someone else’s suggestion and mixed Redline MT90 GL4 with Redline 75W90NS GL5. Solved the problem entirely, but I had put GL4 oil in a transmission that asked for GL5.
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Upon making the stupid mistake of playing with the axle seals in the tranny when changing axles, I made a huge leak (by huge I mean leaving a quart of gear oil on the driveway overnight ). So I began pouring whatever oil I could get in there until I had a professional fix it. I drove the fixed car away from the dealer with the previous GL4-GL5 mix, Mobil 1 synth, Redline 85W140, and whatever the dealer put in to compensate for the loss in my tranny! It shifted fine.
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Feeling uneasy abour having 50 different types of gear oil in my tranny, I took Legacy777’s suggestion, who doesn’t even own an MT Subie , and put straight Castrol dino 80W90 in the tranny. It shifted more smoothly than any other oil I used before. I put the same oil in the XT when I got it with no problems, and after I did my tranny drop on the Legacy, I bought some el cheapo Coastal 80W90 in a gallon container from Discount for $5, and mixed that in with the rest of the Castrol I had around. That’s what’s in the Legacy now, and it shifts beautifully.
Therefore, synthetic oil is too slick for Subaru manual transmissions. Its extra-slick properties do not allow enough friction in the synchronizers and the gear speeds are not properly matched. Others on different Subaru boards have tried my methods and reported similar results. I feel my argument is based enough on simple trial-and-error to refute any mathematical claims Redline or anyone else may make.
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