I am running Royal Purple 10w-40 in my 03' WRX and it has 91k on it. I have a catless DP and P&P TD-04. I am burning about a quart of oil every 200 miles and smoke pours out of the tailpipe, it's blue and smells like oil. I am very concerned about this and was planning on putting in some type of 5w-40 soon (hopefully Motul). I just did a turbo swap at 89k and I used 20w-50 conventional to break it in. Could this cause me to burn so much oil or is there something mucu, much worse going on? The car runs great and still pulls hard and other than the smoke (intermittently occurs) it runs like it always has. Am I looking at a very serious problem or could it be because I'm using 10w-40 Royal Purple?

 

Blue smoke is usually an engine burning oil, there are a few possible problems on your plate, typically I would just say a blown seal in the turbo but I would take it to a professional and have it looked at.

 

check the play on the turbo first check if you have oil on the charge pipe

 

I didn't know subaru's had charge pipes

 

its either the turbo inlet or the Y pipe. check ur intercooler for oil if u have a top mount.

 

I'm pulling the intercooler tomorrow to see what if I find anything, but the new turbo has just over 1500 miles on it since it was rebuilt and ported by deadbolt. I'm going to do a compression check tomorrow as well. Any other thoughts before I start tearing things apart?

 

Well I just checked my intercooler and it is dry, as well as the y-pipe. I also just checked my oil (I've been checking it everytime I go to drive it) and it was at a perfect level, but I still get intermittent smoke. While I had the intercooler out changed my PCV valve. I then took it on a test drive and the car drove great and didn't smoke at all, even when I let it idle for a few minutes. I'm still changing the oil tomorrow though, just as a precaution.

 

Dude take that crap oil out and put something decent in there. I used to run RP until the OA came back. The 5w-30 i ran sheared to a 20w.
Also, my bugeye ate it like nothing i have every seen. Well, except M1 it drank that too.

 

Haha man, that makes me feel a lot better. I'm going to buy a quality oil and hopefully stop all of this smoking.

 

I don't know about stopping the smoking. Sounds like you got some compression issues.
Get a comp/leakdown test.
But, i would switch to a hearty oil either way. Go to Walmart and get some Shell Rotella 5w-40 (Blue bottle its synthetic not the dino). I think its 15 bucks a gallon. Pretty cheap too.