transmission fluid... - Page 2 - Subaru WRX Forum
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post #16 of 20 Old 01-12-2009, 08:05 PM
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Sorry I get excited. I think I will use the Subaru 75-90 gear oil (K0323AA093) in the transmission, and replace the Mobil 1 75W-90 synthetic gear oil with the Subaru 90LS LSD oil (K0305Y0900) in the rear end. Plus if I buy the 5 Gal. of Subaru 75-90 gear oil (K0323AA093) I should have enough for transmission oil changes for life. If anybody has anymore input on this please let me know.

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post #17 of 20 Old 01-13-2009, 07:27 PM
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Motul Gear300 75w90

I previously used stock fluid (Subaru Extra S), Redline 75W90 NS, and USC. They all have worked great, but overall the Motul has been the best (thorugh 7K miles).

Also, there is a huge thread over on NASIOC about USC (basically that the different components never mix right) and I think most are staying away from it.
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post #18 of 20 Old 04-01-2009, 02:14 PM
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Its ok to run full syn in the trans correct? Mines hard to shift into reverse and 4 grinds a lil going in.
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post #19 of 20 Old 04-02-2009, 12:18 AM
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Yeah, definitely. Full synthetic is fine in your trans. I use Redline 75W 90 NS in my 07 WRX trans. I switched from stock fluid to that at 3,000 miles and I just hit 30,000 recently and put fresh stuff in and it made a very noticeable difference. It's like butter all over again. Use whatever brand you want and I'm sure you'll notice a pleasant difference too.

John
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post #20 of 20 Old 04-03-2009, 10:27 PM
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My car is in the tranny shop right now. And instead of letting the guy load my tranny with his generic crap, Im buying Motul 300. Its the single best gear oil you can get, says a lot of people who know what they are talking about. Ive used USC and its worked great so far, but, Ive been hearing some bad things, too. And I can understand how all the different oils probably dont mesh together very well.
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