Just bought my first Audi (1999 Audi A4 1.8T Quattro). It seemed alright on my short test drive but on my hour commute back home from buying I noticed something concerning. Whenever stopped in traffic and when accelerating from said stop, the car produces a blueish oil smoke. I've seen older posts about bad turbos, pcv valves, and blown valve seals but no definite answer on what the problem could be. The car seems to still have a fair amount of power and runs with a very slight miss. Turbo is a little quiet though. Any ideas?