Thought I'd share. The 60K miles 2006 M3 was starting to idle rough. I purchased the sea foam spray top engine cleaner and lube for $9.84. Used as instructed, emptied the can and blew some smoke. While it sat for the 15 min of soaking, I changed the oil and filter. After, as instructed, drove aggressively to remove remaining buildup. Must say she idles smooth now. Hope it lasts.

 

careful using that in the cars.. you can blow them up if you add to much or cause damage specially to small engines.. always follow the directions on them.

some additives you should be careful adding them.. specially for those who are under warranty. always make sure its OEM approved.