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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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