I've used B&G engine purge. It was recommended and purchased at my local dealer. It's been a while siince I did this but I think it was a 2 part kit for about $45. Chris Can anybody tell me how reliable GUNK MOTOR FLUSH is, if anywbody has had any experience with it. Also, if any other brands are worth mentioning, info on these types of flushes would be appreciated. Thanks.