Almost all modern oils are going to carry the latest API classifications, most others that carry older classifications are single viscosity or specialty type oils. Keep in mind API classifications always supersede older ones. The Oreilly oil carries a dual classification, meaning it passes classifications for gas and diesel engines. Dual classification oils are arguably superior to single class, as they offer better protection and can service multiple engine types.
Omni Specialty Packaging is oil/chemical company that can make, package/bottle and distribute all sorts of chemicals and lubricants for anybody. They more than likely do this for dozens of companies, even in direct competition of each other. They do this for Oreillys and who knows else. BTW I think AZ utilizes STP for the same thing.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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