From the Sea Foam website:
dumb question but what is sea foam and what is it used for???
"Sea Foam® is a safe and versatile additive that can be used in fuel, oil or added directly into the combustion chamber on 2-cycle, 4-cycle, rotary and diesel engines. Sea Foam® is a 100% pure petroleum product, so it is as safe for seals, o-rings, sensors and other fuel system and engine components as the fuel or motor oil that runs the engine. Sea Foam® contains NO harsh chemicals. All three types of engines (2 & 4 cycle, rotary and diesel engines) suffer from the problems described below, all of which are addressed by Sea Foam®.
1. Old petroleum residue (gum and varnish) buildup. All fuels and engine oils leave behind residue deposits that accumulate over time. In the crank case, this residue builds up around lifters and rings, preventing them from functioning properly. In the fuel system, residue builds up in the injectors or carburetor jets, on the tops of pistons and on the backs of intake valves. Carbon in the exhaust adheres to this residue and forms carbon deposits. THERE IS NO DIFFERENCE BETWEEN THE RESIDUE IN YOUR CRANK CASE AND THE RESIDUE IN YOUR FUEL SYSTEM. IT IS ALL PETROLEUM VARNISH. Sea Foam® slowly and safely re-liquefies this varnish so contaminants and carbon deposits can be safely cleaned out of the systems as the engine is operated.
2. Lack of lubrication. This can occur in the fuel system as the result of dry fuel additives such as ethanol that actually remove lubrication from the engine components. In the crank case, varnish buildup around the lifters and rings can prevent the oil from properly circulating and lubricating. Sea Foam® contains a high-temperature penetrating, lubricating and cleaning oil that will not evaporate even in high heat areas like the combustion chamber. It is also able to safely dissolve varnish from lifters and rings so the oil can flow and lubricate properly.
3. Moisture. Fuel can absorb moisture from the atmosphere - even more so with the addition of ethanol. Crank case oil can also become easily contaminated with moisture. Sea Foam® fully encapsulates the water molecules in the fuel and oil to prevent phase separation - rendering the absorbed moisture harmless.
By addressing these three key factors that produce premature engine wear and cause many common drivability problems, Sea Foam® can be used by professionals and do-it-yourselfers alike to safely eliminate many contamination and lubrication related performance problems and help prolong the life of an engine. A clean, dry and well lubricated engine will run smoother and more efficiently."