[quote=Hobie]Since we are armchair mechanics 🙂 here is a different theory:
I listened again to the video and heard a small popping upon decel. Do you have headers?
If you are not having a significant drop in water level, and oil level is not dropping either then that popping may be afterfire.
Afterfire is not backfiring but unburnt fuel in the exhaust. Then I remembered you have a performance chip in it. Could that be causing it to run rich? Or at least delay in the injectors cutoff??
The kicker is that it is not consistent. Seems to have larger plume at first ( idling longer ) then less. hmm. ( Pass compression test then turbo seal is my bet)
There are some guys that feel the synthetic oils due to their more slipperiness can get past seals causing leaks. More of a long shot here as your car probably speced a certain oil due to the turbo anyway.[/quote]
I went back to stock so the pop is always with stock
