RC engines running glow fuel (castor oil + nitro) are different. When I flew RC airplanes that run glow fuel, I found they would gum up if I didn't flush them. At the end of each day I would cycle ATF through the engine. This worked well: stopped them from gumming up, prevented corrosion and over years of use didn't seem to have any negative effects.So, as I thought, most people agree that an oil film will stay on the engine parts for years if not forever. I am wondering then why a small engine that I have seized hard in place after 5+ years of non use. I can't get the thing to move. Now I make it a practice to turn my model engines over by hand several times yearly. So the same thing can happen on a full size car engine? If an oil film remains on the engine how can it seize up?
They require "ashless dispersant", and ashless means no Calcium or similar elements. For more on aviation related lubrication, Mike Busch is a great reference, like this. For your specific question, jump to 47:40.Why don't aircraft engine oils use some of the beneficial additives that PCMOs have?