Turbo seal seepage? That makes me chuckle..
Yes the PCV is open under light load(vacuum) and not boost. But The remnants of that oil and sludge doesnt just instantly disappear down through the cylinders. Pull an intercooler off and see the film of oil coating the insides or in your charge pipes! Yuck! You're ingesting that oil throughout the range, just in varying amounts.
The Coopers are notorious for this as well. I'm still certain it's to do with PCV and the lack of any and all particles of fuel through the runners, ports and backs of the valves that is the issue.
I'd like to see some proof otherwise. But in the interim, while the car is new and hasnt seen any buildup, I'm gonna be trying to prevent it with an OCC and a water meth setup!
Someone else chimed in, during a previous thread saying that they didnt see any difference with those two additions. But I'm betting they were made AFTER the buildup and they were not effective in getting rid of the caked on buildup. Time will tell
