MCCC = Mopar Combustion Chamber Cleaner
Seafoam is another brand of Combustion Chamber Cleaner
A combustion chamber cleaner cleans carburetors, intake manifolds, intake and exhaust valves, pistons and combustion chambers. It also removes deposits, eliminates carbon knock and restores performance.
Some people swear by it, others are on the fence. YMMV.
Mopar Combustion Chamber Cleaner/Conditioner is really good for removing carbon deposits, but the directions on the can are not so useful. The following directions outline the way that professional mechanics have been using the cleaner for years -- they were finally published in TSB 18-31-97 for 1996-98 Jeep 4.0 Liter misfire conditions:
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