May be more of a problem due to direct injection than with turbochargers, since the fuel detergents don't get to the intake ports.
I have always made sure to get the engine up to temperature, and then use the upper rev ranges every now and then. Used to be called an Italian tune up. I never had a problem with carbon buildup with my 2008, but that is a sample of one.
__________________
2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
|