Quote:
Originally Posted by Flyboy1st
I have been working on Model A's for about 10 years and all kinds of aircraft(Air Force and civilian) since I was 18, 63 now. The best oil in my experience is a high quality synthetic for all engines, piston and turbine. Best for quality and price is Mobil 1, for Model A's the High Mileage blend Mobil 1. Look for it on sale and buy in the 5 Quart size, buy a bunch and change often, filter if you can on engine.
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A main feature of "High Mileage" oil is that it contains seal softening and swelling agents to stop/slow down/prevent leaks. Since there are no neoprene seals to swell and soften in an A, High Mileage oil should not be needed.