Removing carbon from heads and pistons.
Surely this is RV related since it is cutting into my recreational time. :h My 2 cyl opposed Briggs in the lawn tractor has progressively gotten noisier. It was knocking sort of like the same musi...
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sea foam is great stuff... unless the build up is that far along... not sure if it would loosen (or if you'd want it to loosen on a running engine).
