I was called Stupid for doing this. That won't happen again. I mix Marvel Mystery, Sea Foam and Berryman's Chem Tech. I mix it in about equal amounts. Works great for me. And cuts down the price of SeaFoam if you figure the long range plan. I buy the SeaFoam when they put it on sale by the gallon and now that we have a Rural King I can buy it all in the large containers which is usually a lot cheaper. Now my secrets are out!!! I use this when I know they are dirty. I use SeaFoam and Mystery Oil about equal amounts to keep them clean.