Gyrobob
Serious Thumper
   
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Posers ain't motorcyclists
Posts: 2571
Newnan, GA
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Seafoam is just a solvent, about 50% light hydrocarbon oil (pale oil), 30% petroleum naphtha, (charcoal starter fluid/mineral spirits, whatever you want to call it), 10% isopropyl alcohol, and 10% water. With the exception of the alcohol (added to keep the water in an emulsified suspension), the components are the mid- to upper-tier byproducts of hydro cracking useful petroleum products from crude oil. Those that are usually hardest to separate (normally done through a centrifuge) are simply sold as a mixture with some alcohol added to keep it volatile and emulsified. IOW, Seafoam is refinery waste.
So, when you put it in the gas, it tends to dissolve dissolvable deposits. So do lots of other solvents.
I'd be worried about putting it in crankcase oil. I don't know what it would do inside the engine.
If you must dump some in the crankcase, -- use it like several other products marketed to clean up the insides of your engine just before an oil change -- dump it in with the engine warm, and run it at a fast idle for a few minutes, then drain it all out right away, and hope you didn't hurt anything
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