Quote:
Originally Posted by Johnny Mullet
SeaFoam - Great for cleaning a gunked up engine, but not as an additive.
Marvel Mystery Oil - I dunno because it's so mysterious.
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Seafoam does NOT belong in the crankcase. It's pale oil, lighter fluid, and rubbing alcohol and does not have the proper cleaning ability or lubricating ability to be in the engine.
I am a huge fan of
Auto-Rx Engine Cleaner and FP60 by
Lube Control
I've been successfully using them for years. Nothing has improved my mpg better than those two products on the nearly a dozen or so cars I've used it on.