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I know I'm late to the party, but I'd say run a TRUE 30w like Castrol GC for spirited street driving. The M1 30w's are a little thin. If you track the car, I'd go with a 40w--I like M1 TDT. 50w's seem to get a little too hot, at least in the 2.0L mill.

I'd say run GTX or another good 5w-30 dino for the first couple oil changes and switch back to synthetic somewhere between 5000 and 10,000 miles. Then consider a track day =). You're missing a lot of the car's potential by not taking it to the track, it's really much too fast to push it...

I say run GC all year also, along with the Subaru oil filters. Even on a 100 degree day on the track, a good 5w-40 like Delvac 1 is plenty and will give lower oil temps than a 15w-50. One thing nobody mentioned is you might want to break in the car with dino oil and use some boost during the...

I've run M1 T&SUV since 6000 miles on a stock '04 WRX wagon with 19k now and no oil consumption. I think burning oil is caused by improper break-in (not heavy enough on the throttle to seat the rings or too much revving past 4000 rpm) during the critical first 1000 miles. I know that was the...