Love my new 2010 135i. It has the M-Sport Package and is a 6 speed manual. The power feels like the old '68 Ford 302 Boss Mustang, I remember rumbling around in, great grunt, big smiles! I think I will want to keep this car running well for a long, long time. I read about problems with Direct Injection and gunk buildup on the valves, caused by the PCV system dumping crankcase fumes onto the valves. Normally I would use Shell V Power and some injector cleaner and be pretty certain that I was treating the buildup issue. With Direct Injection, dumping the fuel and fuel additives don't get to the valves, right? How do we keep these engines clean and strong?