Who uses synthetic motor oil in their WRX?

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11-27-2002, 06:05 AM

#31

Mach5WRX

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Mobil1 can't go wrong!

11-27-2002, 06:17 AM

#32

Rich10

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I switched to Mobil1 at approx 3,000 miles. I don't think that you would be able to notice a performance benefit. I view it more as a reliability benefit. The oil should degrade less over time. I still change the oil every 3,000 miles.

11-27-2002, 06:58 AM

#33

scooby5

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Quote:

Originally posted by Lobster Man
I would defenatly not use synthetic. Especially in the tranny, unless you want it to blow.

Lobsterman, care to elaborate on a rather sweeping statement!

Why wouldn't you use Synthetic oils? And why not especially in the tranny?

I've run Castrol Syntrans 75w90 in my S4, and I use Eaton Fuller (Trucking products) 75w90 synthetic gear oil in my STi RA gearbox for over a 1 1/2 year. I've used and abused the gearbox over that period.

I opened it this summer to change the pilot shaft oil seal and looked the gears over and they looked brand new. The synchros showed a little wear, which is normal.

Both oils are API GL4 or 5 certified, so they fit the Subaru application chart...

I'm just curious why you say using synthetic products will blow up trannies.

11-27-2002, 08:00 AM

#34

stealth-wrx

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i stopped using oil. i found the human urine works the best. smells great too when its warm.

11-27-2002, 08:22 AM

#35

scooby5

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Ahh yes, urine... Seemed to work for Patrick Swayze's Radiator in Red Dawn...

11-27-2002, 09:40 AM

#36

Dick Fitzwell

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Quote:

Originally posted by evilwrx
Mobil 10w30 at 7500 miles, I change every 5000. I do lots of highway driving

me too. about 85-90% of my driving is highway. i can't remember what the user manual says but i thought it said around 7000 miles? anyway i change it ~5000 or 4 months. i run the amsoil 7500 mile oil, figured i should be ok.

what is with mobil-1, why is everybody running it?

11-27-2002, 09:52 AM

#37

John #555

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Location: OC, CA

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Car Info: 02 WRX

Quote:

Originally posted by scooby5
I'm just curious why you say using synthetic products will blow up trannies.

I've read synthetic in tranny provides too much for the syncros to work - not enough friction for syncros...

11-27-2002, 11:08 AM

#38

scooby5

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John,

That's a good point. Some gear oil have friction modifiers, some don't. I think Redline is one of the brand that does that.

I haven't had a problem with the Syntrans (I think it's not called Syntec gear oil) or Eaton Fuller with my synchros.

I figure though, as long as they meet the API guidelines and the viscosity's there, then it should work. Some people might have different experiences.. anyone else using synthetic gear oil?

11-27-2002, 11:20 AM

#39

John #555

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Car Info: 02 WRX

Quote:

Originally posted by scooby5
Some gear oil have friction modifiers, some don't. I think Redline is one of the brand that does that.

Should we apply this to viscous LSD's also? wait, what type of LSD do WRX have? viscous or torsen?

11-27-2002, 11:32 AM

#40

scooby5

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Viscous centrediffs are incased and do not use the tranny gear oil, so that's not really applicable.

The rear LSDs would matter depending on the type. I have a SureTrac one and it seems to work fine.