First of all, i like to say that this forum has been a great help for me for some time.
I'm the DIY kind of guy, and with some internet help, i've been managing quite well.
I've got myself an 2006 Impreza WRX 3 years ago. The prev owner tunned it, it's got the big intercooler, the STI size turbo and 1.5 Bars of boost, so we can say it's around 350HP or more. I have no ideea what's been done inside the engine. I got it at 30k Km and now i'm at 90k km.
The car runs well, but it's eating up oil, 1liter at 1500~2000km on average driving aggression, more or less. I know that's nothing to worry about, since it's not giving any other signs of something being wrong. The other thing, at startup when cold, puffs a little white(blueish smoke) out the exhaust, especially if a give a little jolt on the acceleration pedal.
I've decided to try and tackle those problems.
I want to confirm it's not the head-gasket, but since the temp is always ok, no matter how much i floor it, and no loss of coolant, it's probably not that.
So i looked for oil in the intercooler and pipes, to see if the turbo seals are the problems for the oil loss or the blue smoke. It wasn't any liquid oil in them, except a bit of black residue on the walls from the exhaust gases. Not that much to make me worry. next step would be a piston ring, or cam seal. I'm using 10w40 castrol in it, it's a bit thiker, i know, but since i have no idea what's inside the engine (maybe forged pistons/rods or maybe stock) i believed it's a good compromise for both possibilities.
I know there are loads of cleaners and engine improvement solutions out there but if i'm on the edge of a bigger problem that would only make it worse, so i don't want to try anything that's irreversible.
What i'm asking from you is that maybe there are some tricks i have't come across yet, to troubleshoot those two issues step by step, with minimal risk.
Please feel free to add any info.
Sorry for my english and spelling it's not my first language.