A simple approach: The chain saws and weed eaters used at home use Stihl oil at 50 to 1. I simply carry the can to the field.

No one is going to get 100,000 miles on a model airplane engine. The crash is going to damage the engine a very long time before it wears out.

When is the last time you saw an air filter on a model gas engine? If longevity were of concern air filters would be used.

Oils affect performance in a minuscule way. There are orders of magnitude more performance to be gained by tweaking other engine variables.

Other than using a good grade of two stroke oil the type of oil is unimportant to the big picture.