Amsoil has paid for plenty of API certifications in the past. I have no idea if they do it anymore (and don't care). Amsoil was one of the first companies in the USA to market a synthetic motor oil in the USA at a consumer lever. That was the mid-to-late 1960s and that first oil certainly was API certifed. Anybody can get an API rating. All they have to do is pass the lab-tests and pay a bunch of fees. I don't recall at the moment what company actually made it for Amsoil, but I guess it's not relevant anyway.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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