So my car is giving off blue smoke during startup which quickly dissipates. It's consuming a decent amount of oil. I've noticed more smoke if I'm parked for 5-10 minutes. I do a lot of city driving. In the morning after sitting it seems like less but it's actually seems very inconsistent. Sometimes it will be a gigantic amount of smoke, other times not really visible (or maybe I'm just not seeing it from inside the car.) I've already swapped out the turbo for another used one because I was having overboost issues. When I took of the turbo manifold I didn't notice anything unusual in the exhaust ports or in the manifold itself. I'm thinking valve stem seals. Oil sitting on the valves makes its way down into the cylinder via gravity? From what I understand there's no vacuum in the manifold but that still doesn't prevent oil from being sloshed around and finding it's way down there? Car has 430,000km on it. Let me know what you guys think.