Amsoil Small Engine Oil 10w-30 has heavy doses of zinc plus other additives for small air cooled engines and is good for 200 hour change intervals. I run it in a 109 that gets 150-175 hours a year put on it that has gotten 1 oil change per year every spring for the last eleven years. It maybe uses 1/2 pint every 20 hours and is never black when changed. I live in northern Minnesota and it gets snowblower duty in winter. It starts fine but that could be due to the fact that I also run Amsoil full synthetic hydraulic oil in the hydrostatic transmission. Amsoil was the pioneer in synthetic oil and would be well worth your time looking into it. There is a lot of technical information on their web site. Hope this helps. Have a great day!
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