[RabidSTi]

I just changed the tranny oil with 75w90 valvoline and the rear diff with the subaru lsd oil. Combined with the TiC shifter package, shifting is tight yet smooth. Definitely worth the time and money. Fairly easy maintence to perform, only specialized tool is the pump to get the oil into the rear diff.

[Neanderthal Racing]

motul competition ff
finger licking good.

[neal0124]

Originally Posted by salaki

30K is coming up...

I need to change my Tranny Oil.

I'm thinking of either going regular conventional oil or going w/ Silkolene if I want to do Synth.

And I also heard that Silkolene is not good for STi's rear diff so that many still keep using dyno for the rear diff.

I also heard there's a Subaru's synthetic tranny oil.
Is this true?

If I decide to use Dyno oil, what would Subaru use?

All I want is just grinding free just like OEM.
I don't really care about dyno/synth as they work great.
But why not spend more if I could get a better protection w/o additional headache.

STi owners or those w/ 6MT
Please help chime in on what oil do you use.
Please be specific on brand, viscosity and whether you put different oil in tranny and rear diff..


Thanks..
David

I put royal purple 90wt in trans and rear diff about 15000 miles ago. my car now shifts smoother than it did when new, I have no grinding at all unless im shifting with no clutch and i botch a rev match. the oil already has limited slip additive in it and I swear im getting better gas milage(.5-1.5 more mpg). I just changed my oil today and when I checked my trans oil it is still purple. I never tried any other type of oil but after using this stuff im not gonna bother trying anything else, I love the smoothness of my gearbox/shifts. like butta!

[whitson01]

what would you guys recommend for rear diff oil if i dont get the factory subaru stuff?? what would i be able to get localy??

[solbergfan]

Originally Posted by whitson01

what would you guys recommend for rear diff oil if i dont get the factory subaru stuff?? what would i be able to get localy??

Motul 90PA LSD oil is about $20 for a 2 qt. bottle. It is a mechanical LSD oil just like the Subie stuff. I doubt you'll be able to find a Motul dealer locally-it usually has to be ordered from the 'net.

[boostedrex05]

i used redline when i had the stock fluid in i noticed a grind sometimes so i babied the car from then on now i have redline mt90 in my rear diff and ns75w-90 for the tranny works great shifts fast and easy no more grinds and yes i push the clutch in all the way between shifts.. other then that i recomend redline oils for the 05 sti your choice thow..

[whitson01]

i have redline in my car now and it grinds and binds.. i dont like it at all.. anyways i can get royal purple localy, whats your guys thoughts on it??

[whitson01]

come on guys.. whats some more opinions on which oils to use??

[SCOOBYTRAP]

Neo Synthetic lubricants for tranny fluid


http://turbomagazine.com/features/0305tur_wrxgearset/

Quote: "We stumbled into the ultimate Subaru tranny oil info. We all know the basis for R&D on the WRX is rallying, so what does the World Rally Championship Subaru team run in their cars? Neo Synthetic lubricants, which are manufactured and distributed here in the United States."

[Neanderthal Racing]

Originally Posted by whitson01

come on guys.. whats some more opinions on which oils to use??

not to be rude whitson but how many opinions are you looking for, exactly? if there's not that many people responding it's probably because it's been done to death.