What is the gas oil mix ratio for a 15 yr. old mercury 2.2.hp.outboard boat motor?

Regular gas station gas will be OK, but don't leave it in the tank for more than maybe 6 weeks. Only buy what you need and mix up smaller mixes. Dump what you haven't used before you put the engine into storage.

The ethanol attracts moisture, and that causes all sorts of issues. Use a 2 stoke oil that's designed from Marine use. Water cooled engines run cooler than air cooled (chainsaw / dirt bike etc) so they use a different formulation of oil.

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