Steven. the glow engines have oilite/bronze bushings in the rod. They require a good supply of oil for lubercation. The ball bearings on the crank can run with a lot less oil that the bronze bushings can. With the gas engines, and they are usually a bit larger than the glow engines, they have the room for the needle bearings. Now the oil requirements is greatly reduced.

You can run run your glow engine on a 40 to 1 mix, untll the rod go out. You can run a gasser at 18% oil also, but it won't run it's best. They have diesel engines that take all their lube from the diesel fuel. A few years back I saw where a Japanese company made an all ceramic engine that didn't use any oil. What's the old saying? Different strokes for different folks. What works for one wonn't for the other.

Don