i have a 05 wrx with 120xxx miles it will smoke not bad after a good drive 10-30 miles. its a whiter smoke. and after the motor has a smell that reminds me of after u cut or grind steel with a grinder. -i know sounds bad... it has a turbo back exhaust w/ non cat up pipe, -stage 2 cobb. i run mid grade gas 87? i did recently run a tank or 2 of 83. i never come close to redline highest i'll shift is...6 usually 5. i just changed to synthetic mobile 1 5-30 i believe... last oil change which was about 1800 miles ago.
i was thinking that since im usually on the high way before i notice it that maybe since im running at boost for 30 minutes its getting alot of blow by or just oil vapor from the pcv.
if thats true, a oil catch can should fix it. -idk im new to the whole nice car thing. any thoughts greatly appreciated. thanks for your time.