I dunno if they call it crankcase cleaner, but it goes in the oil and is a full gallon. Saw it a PepBoys and was waiting to see of anyone was posting on it here. Curious, I popped it open to smell and it was oily and like MMO, but not so much solvent. Instructions were run in crankcase (after draining old oil) at idle for 10 min and drain or something like that. I would feel better with a fully-formulated product like this, rather than an additive flush. I like this because it has the lube built-in, rather than additives (solvent) that give the impression that lubrication is an afterthought. Some, like SeaFoam actually suggest driving with that stuff in...spreading the sludge around evenly after it evaporates would be the result of that. Anyway, Gumout Professional Engine Cleaner....it exists. Price was good too, like $11.