I got my 2002 Camry when it had 86K and now it has 97K on it. In the morning when I start the engine, I see blue-ish smoke coming out of the exhaust for a while. I don't know if I had it before, but it's more noticeable recently. The smoke does go away after driving for a while.
I assume the original owner used regular oil and I switched to Mobile One 5W-30 right after I got the car. I suspect it may have a semi-leaking valve seal, and after switching to synthetic oil, it worsen leak and caused blue smoke.
So my question is should I just switch back to non-synthetic oil? or just stick with it?
If I stick with the synthetic, that means I should replace the valve seals when oil burns too much, so far, it's not noticeable. If I do replace the seals, what else should I replace at the same time?