2000 Passat GLX V6 - 5-speed manual - just turned over 150k miles
For the last few weeks, the cold starting has been worse on my Passat than Cleetus. When it sits overnight, starting it up produces a large cloud of blue, wispy smoke, and there is a miss for a few seconds. When it sits for more than a day during the weekend, it will kick and stall once during starting before firing up. For the first time since we've owned it new over 12 years ago, I need to use the gas pedal to get the revvs up at startup. After 10-15 seconds, it idles smoothly and drives very well.
It's got various oil leaks - cam seals, VC gaskets (which I recently replaced) - but this smacks to me of valve seals. I'm just surprised at how badly it's deteriorated over a few weeks.