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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Originally Posted by Werner
Hallo "Oil-friends"!
This should not give a new forum post series (there are already enough of them)!
But today I dismantled the valve cover. I only sprayed the valve chamber with brake cleaner and blown it dry with compressed air. The photo shows how clean the inner life is. Only in the narrow corners, I have discovered something "tar".
The engine was operated 2500 ml with 20W / 50 SC oil; changed every 500 ml.
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