Thanx muchly.

Was trying to figure out why in reality VW DI's seem to not coke up when runnign WVO compared to what they "say" about other motors. A few of us got to thinking maybe it was the pistion swirling action of the VW piston.

I Dont know about Mercedes DI's coking up. Not much data on that. GM DI's seem to do ok too? It seems all DI's have swirling chamberish type pistons so maybe its not cause of that. Any ideas?