I have been following reports of carbon buildup on BMW turbocharged DI 3.0 liter engines. Although this seems to be more of a problem with stop and go quick trips, I would like to know if a treatment with a cleaner such as CRC sprayed directly into the intake above the valves every 10,000 miles would be a feasible option. I have heard accounts of Honda dealerships doing this automatically as part of the oil service on DI engines.
Yes you can do this by using CRC or seafoam to help clean the carbon up. But you need to be very careful pouring liquid into the intake can cause engine damage from hydro locking. The best thing you can do is not short trip the vehicle and do some spirited driving to help break apart any carbon. I have seen some people putting a oil catch can on the N54 crankcase system to help keep oil from getting to the valves causing carbon build up.
