I met with a tech in Houston an hr ago. He suggested taking the heads off and using Sea Foam. Carbon Build up is a common issue with several BMW V8's and some of the straight 6's as well. He quoted me for $200.00. I did sea foam about 8months ago, but I just put it in the gas tank I never thought about taking the head off and pouring it in there. He also informed me he has performed this job on two 7-series BMW's and was successful at it.
Last edited by mrringtone; 09-30-2011 at 03:57 PM.