A lot of people have added MMO to the A-Rx rinse cycle and got better results. It's been mentioned, finding it with the search engine is pretty tough though. MMO alone does a great job, but the king of the slower engine cleaning products seems to be Kreen.
Originally Posted By: Topo
Maybe the poor step child of additives, Marvel Mystery Oil would do the best job, LMAO..Now wouldn't that be cool.