I contacted the airport for pricing. Waiting to hear back. They carry 100, w100 and 15w50. I'd probably try the multi grade since it has the lycoming antiwear package, ashless dispersant and half synthetic base stock. Seems like that would be the most practical of the choices, especially considering the toys are pull start, and I dont think I want to pull start with straight 50 in the sump lol.From years and years of practical experience, I really can't tell a wear difference between any of the aviation oils. Other than the AS 15W-50 leaves somewhat fewer deposits under the valve cover. It seems to me, oil change frequency is far more important than brand.
These guys get 2380 turbine oil. During a recent engine "midlife" the BR710's looked perfect inside. So the 2380 worked just fine.