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Cheg, the main differences is in the blending for combustion temperatures, cold flowability, ash content, anti rust ability, concentration for mix ratios, to meet certain requirements for different manufactures, & for use directly in fuel/oil mixtures or for use in oil injected engines. ~For use as a fuel additive in a 4 cycle engine, bearing load & bearing protection isn't an issue so it probably doesn't matter what you use, it's the slight amount of oil added to the gasoline that helps lube the upper end, valve seats & carb internals. A guess would be an ashless oil might perform better but doubt you could tell the difference. ~As far as engine upper end lubrication goes it probably makes little difference if you use motor oil, Marvel Mystery oil, or other upper end lubricants. The biggest gain with using a 2-cycle oil is it is designed to burn cleanly & not foul spark plugs, designed to stay mixed with gasoline, designed not settle out like Mystery oil, & is designed to flow better in cold temperatures. ~Since my original post on using 2-cycle oil as a fuel additive a few years ago I have received many E-Mails on the mix ratios & type of 2-cycle oil to use & the response is always to just use an ounce or so per gallon or about a small concentrated can per tank full of fuel. There is no real magic number & you can probably use as much as you like right up to the point of plug fouling or engine smoke. ~It does seem to keep the iron carbs from rusting up so bad inside during storage & doesn't cause a plug fouling problem after storage like Mystery oil does. With the added benefit of not leaving the cylinder wall so dry after shut down..
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