I can't imagine anyone wearing out a modern gas engine. They live a terribly easy life and at 10 to 15 min a flight 3 times a week, they really don't get much use.

With that said, I think your question is a little incorrect. Your questing seems to suggest that engine life is what defines a "good" oil. Engine life is not the issue for myself or most modelers. I think the real issue is how cleanly your engine runs. I want an oil that doesn't stick rings, foul plugs and throttles crisply. Since engine life is a given, I don't add that to the list. There are ENORMOUS differences in how oils performs when it comes to keeping and engine clean and thereby, running reliably over time. I already have a job. I want my gas engine to start and run without weekly cleanings and tons of flipping.

Short answer... You would be better served choosing an oil (and mix ratio) for reasons other than engine life.

Bill