NickD said:JBasham said:So with these DI setups, a good spell of high RPM driving doesn't burn the carbon off?
Nope. Becuase you don't get the fuel wash over the valves to clean them off. They also cook the oil on the pistons (due to higher combustion temps) and stick the rings and then start burning the oil
As I've heard it, running the car hard might not clean out large built up deposits, but should generally prevent excessive deposit formation....So the old "Italian Tuneup" still supposedly helps on DI engines, it just needs to be a part of the daily maintenance ritual.
