Hmm, at those rpm levels you would have to use a very high quality oil to avoid premature wear. I remember a product advertised early one April several years ago called Parflo Oil (I think it was spelt like that). The manufacturers of this oil had managed to reduce the coefficient of friction to slightly less than zero. Any engine that used it would actually have negative wear.

You would use it straight for an old clapped out engine to improve the compression, or mixed at an appropriate % with standard aeromodeling oils (castor or synthetic) to maintain the pinch in an ABX type engine.

Must see if I can find some to try out when these engines come out.

Cheers Dave H