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True, but the Exxon engineer was not responding to why Exxon's product was superior to competitors. He was responding to a question of why no oil manufacture produced a full-synthetic oil for piston aircraft engines. His explanation was not why Exxon Elite was the best choice but rather why...

That was really interesting to read their recommendations. I don't really understand them but interesting. I can't see any reason a blend would not be superior. Here is the link to Exxon Elite which is a semi-synthetic blend specific for aircraft engines...

[This post and response got run together and have been modified to separate the response from my original post.] Thank you for moving it to a new thread and for the great comments.Absolutely true about the old 1940 and 1950 technology air-cooled engines. Their tolerances are not nearly as...

Good question... As far as using full synthetic I think the motivation is to improve overall MPG for the fleet. The very thin 5W-20 oils improve MPG slightly and I think the manufacturers care more about that than if it is good for the engine over the long term. About any oil will make it...

I have not used Amsoil in many years (except for their grease which is excellent) simply because I learned that a synthetic blend is better for engines with a filter. There are many good blends available. My personal choice even when I ran Amsoil was to still adhere to the recommended change...

Actually, for internal combustion engines with pressurized oil circulation and filters synthetic blend is superior to synthetic. I used to be a "full synthetic in everything" kind of guy. Way back in the day I even used and sold Amsoil. But about a decade ago I bought a piston airplane...