Snake Oil!

No,dont misunderstand me,I have no experience with "Seafoam"
But breaking loose all the sludge in a sludged up engine with anything can be disaterous!!! I just changed the oil in a customers comanche pu(so sludged up nothing came out when the drain plug was removed...Had to poke a hole in the sludge covering the hole with a wire)It was towed in the next week with the bottom end out.(I told him it was a bad idea..Had not changed the oil in 6years!!)