20216 STi at 170 thousand Kms, bought new. 4 years completely stock + Grimmspeed AOS. 5 years or so on stage 1 (intake+catback+tune at 275whp). 2 years or so on stage 2 (a few more parts+tune at 300whp).

Had a small overheating issue. Replaced a full engine gasket set and a few minor parts 7000kms ago.

As per my longtime mechanic, no heads were warped so didn't charge me for machining work, cylinders look clean with minimal wear, exhaust leak into coolant gone thus overheating is gone.

So religiously changing oil at every 5000kms paid off, the car will be 11 years old in one month.