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Old 06-03-2001, 10:07 AM   #1
Jimmy
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Member#: 586
Join Date: Dec 1999
Vehicle:
2002 WRX
Blue

Post Mobil One synthetic Tranny fluid is it worth it

It it worth using this in a Impreza RS 99

I am hopefully getting a turbo from ASR

I want to change the tranny fluid to synthetic how is that done and does any body know how to do it.and how many quarts does the RS use


thanks jimmy
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Old 06-03-2001, 10:36 AM   #2
PunksWRX
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Join Date: Apr 2001
Location: Colorado Springs, CO. USA
Vehicle:
2004 Impreza WRX STi
Aspen White

Post

I assume you are talking about a manual transmission and gear oil? If so I wouldn't recommend Mobil 1 75W-90 in the transmission. It is too slick and the syncros may not operate correctly causing occassional gear crunch - I know from experience. I am running Red Line 75W-90NS in my transmission (and in my 00 RS when I had it) and it works fine. The NS formula doesn't have the friction modifiers in it that effect syncro operation.

As far as changing it . . . there is a large plug (19mm or 21mm) plug on the bottom of the transmission case right near the Y where the exhaust pipes come together. Remove that plug to drain the gear oil (watch out for the little washer on the plug), and make sure you have pulled the gear oil level dipstick so there is no air-lock to prevent all the oil from draining. Fill the tranny through the dipstick hole. I believe the RS holds about 3.7 U.S. quarts.

Punk
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Old 06-03-2001, 11:03 AM   #3
Jimmy
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Join Date: Dec 1999
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2002 WRX
Blue

Post

I was going to buy Mobil one you dont think thats good

I notice know that the syncros right know runnning the regular stuff at high rpms it crunchs sometimes

Redline is good huh

Nobody in my area carrys it well I don't think anybody does

75w-90ns does mobil one make anything like it
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Old 06-03-2001, 11:26 AM   #4
PunksWRX
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2004 Impreza WRX STi
Aspen White

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Jimmy,

The Mobil 1 gear oil is good stuff but it just doesn't work very well in Subaru's finicky transmissions. I recommend it wholeheartedly in the rear diff. If you go to Red Line Oil's website www.redlineoil.com they can direct you to the nearest dealer. I got mine from Summit Racing Equipment www.summitracing.com for a good price too!

Cobb Tuning www.cobbtuning.com has a good article on synthetic gear lubes in their technical section. Just remember though that Subaru requires a GL-5 rated gear oil. Some people use gear oils that are not GL-5 rated and Subaru could deny any warranty claim for not using a GL-5.

Punk
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Old 06-03-2001, 01:45 PM   #5
cvalle-sd
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Location: The LBC, CA, USA
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2001 Cr-V
Silver

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I used 3 parts Redline 75w90NS and 1 part Redline lightweight Shockproof. The thing is like butter. I used to run Mobil1, but as the other lads say, the gearbox was a bit crunchy. It's a great gear oil, but not for us. I've also heard that Motul 300 is great, but it was easier for me to find Redline.
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Old 06-03-2001, 01:54 PM   #6
goose
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Motul MT-90 may be a good choice as well, I was going to get it myself, but apparently the MT-90 stuff isn't rated for performance below freezing, so I went with Redline 75w90NS, gonna change it this weekend- I'll let you know how it feels-
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Old 06-04-2001, 07:14 AM   #7
Jimmy
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2002 WRX
Blue

Post

iam going to go with the redline gear box oil

thanks for the info

Jimmy
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