2005 Subaru STi oil choice

[TrackRat]

Car is a 2005 WRX STi and see's all kinds driving, lots of short 5 mile trips back and forth to work, spirited runs, and a few track days a year. Factory manual suggests a 5-30 wieght.

Any suggestions on what oil to use?

 

[finalyzd]

heard alot of subie guys run a 40 weight if it sees track duty. mobil 0w40? or redline 5w40? or even rotella

 

[dobie0791]

I use GC 0w30 in my 2005 STi. It is somewhere between a 30 weight and a 40 weight oil. STi engines like GC...

 

[MrWideTires]

I have a 2005 STI with 100k miles still running perfect, do now use a thin 5w30. Use GC, Mobil 1 0w40, or if you want cheap.. Rotella 5W40

 

[5sfe91]

I think Castrol 0w30 (GC) or Mobil 1 turbo diesel truck 5w-40 would be a good choice for your sti.

 

[Unearthed]

According to the manual you can use up to a 10w-50 no? There are a bunch of recent threads on Subie's and after reading those I would use a 40w for sure.

 

[Solo2driver]

Shell Rotella T6 5w-40. Inexpensive, universally available (Wal-Mart), shear-stable especially in turbocharged Subaru applications.

 

[TrackRat]

I have some left over Mobil 1 0w-40 from my previous car. I might give that a shot. I remember burning a lot of it off though...

 

[bluesubie]

Factory manual specifically suggests 5w30 for fuel economy and thicker grades are required for high temps and severe conditions.

No further recommendations as there are a bunch of good ones. The only xW-30's I would run are Red Line, or something ACEA A3 rated (GC, some Motul's). Other than that, xW-40 IMO.

-Dennis

 

[TrackRat]

So I put Mobil 1 0w-40 in. I haven't driven it yet, but just at idle the engine is quieter as it is ticking less. We'll see how it goes.

 

[Nickdfresh]

The Mobil 1 will do fine. After that's gone, I'd look at Rotella T6 syn 5W-40 with the ($20)rebate they've got going...