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Old 07-20-2005, 06:34 AM   #1
jlyttle
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Location: Hanover, MA, USA
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2004 Forester XT 5sp
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Question gear oil for rear diff

Car is a 2004 Forester XT 5-speed w/ 36k miles.

Forget trying to tell me what is best for my gearbox. I have read every thread and am still not sure, but I won't start another thread on THAT. I think that I have settled for Redline 75W90NS. No problems for me in my 2001 RS.

What I am interrested here is in finding the best oil for my rear differential.
My criteria are:

Synthetic
good protection for gears
quiet operation of diff
small improvement in economy
Must meet manual specs! (GL-5, etc.)

Used Mobil1 75W90 in the RS read diff, always thought that I could hear the diff after that. It was definately full and I never had any problems with it, but I want it silent. I would love to hear your opinions and experiences.

P.S.- Can someone tell me exactly what kind of rear-diff is on this car? The RS had limited-slip, don't think this one does. What does it have?
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Last edited by jlyttle; 07-20-2005 at 06:43 AM.
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Old 07-20-2005, 08:48 AM   #2
LyveWRX
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I would say that redline 75w90 (NOT NS) fits what you are asking for.
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Old 07-22-2005, 07:39 AM   #3
jlyttle
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Question

bump...

Cobb claims that NS is best for the diff? Need clarification here...

Also, any other recommendations and why?

Thanks guys!
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Old 07-22-2005, 08:46 AM   #4
west_minist
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2000 JDM Impreza SRX
w/ AVCS Silver

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I have Motul Gear 300.

Works beautiful. The car feels so free.

I use all Motul racing stuff in my car. No even castrol stuff makes my car feel as good as Motul.

Also remeber that Subaru WRC use Motul in all of there cars
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Old 07-22-2005, 09:25 AM   #5
Hayes
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I'v run Mobil 1 75/90 for 92,000 miles without a hint of a problem. Ops I changed over at 1500 miles so it's 90,500 miles on the Mobil 1.

Last edited by Hayes; 07-22-2005 at 09:26 AM. Reason: clarification
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Old 07-22-2005, 09:28 AM   #6
jlyttle
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I understand and respect your input, others have praised Motul as well...it's just that I think that I should have added two other requirements:

1- That I can pick it up in a store
2- That it cost $10 or less per quart

I think that I am leaning towards Royal Purple MaxGear for the tranny and the diff.
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Old 07-22-2005, 12:47 PM   #7
LyveWRX
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Search Royal Purple on thsi fourum, I know two people who believe that if F***** up their trans.

Smaller auto shops may carry redline. 75W90NS does NOT have friction modifiers, these friction modifiers ARE present in 75W90. They reduce the friction between gears. Since the rear diff is viscous and sealed it doesnt care, reducing friction in the diff is the most important. In your trans you need some friction for the synchros to work thats why the NS is reccommended for the trans.
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Old 07-22-2005, 01:23 PM   #8
jlyttle
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Yeah, and lots of other that love it. I am sure that there are lots of broken tranny's out there that were using every lube under the sun. Hard to attribute it to the lube, when people mess there tranny up even using OEM.
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Old 07-22-2005, 02:42 PM   #9
SlvrRS
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Quote:
Originally Posted by LyveWRX
Search Royal Purple on thsi fourum, I know two people who believe that if F***** up their trans.
I'd be more than willing to place a bet that the DRIVER or mech. defect f'd up their trans., not some synthetic fluid. I and many, many, many people I know run Royal Purple in their trans and diffs with nary a problem. In fact I like it so much I've kept using it for years.
I can forward you to an extremely reputable tuner for more info on Royal Purple if you don't believe me. Give Rich at Precision Tuning in Brick, NJ a call.....he'll tell you how many failures he's seen from Royal Purple.

-Matt
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Old 07-23-2005, 11:37 AM   #10
LyveWRX
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http://forums.nasioc.com/forums/showthread.php?t=614659

Hey man I dont care if you use WD40. Just sayin people I know have had trouble with it.
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Old 07-23-2005, 12:00 PM   #11
jlyttle
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Hey, I believe that they had tranny trouble.
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Old 07-25-2005, 12:48 PM   #12
LyveWRX
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Yep, you're right, and in a discussion with safir after tehat discussion. We figured that the viscosity of the RP is going away when subjected to the extreme stresses in the front and center diffs.
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