I have had no failures of bearings. Yes, I'm aware of kerosene in additives and even in two stroke oils. Many of the two stroke oils on the market contain a fair amount of kerosene. And unfortunately I don't know if they rate viscosity before or after the addition of kerosene. I remember one particular Castrol product I purchased last year prior to inspecting the data sheet. That just means that you need to be aware of what you are using.

Ugo, a long time ago you said that the etherless fuel would damage a four stoke engine. A few posts back you said none of the dilution issues exist in a model four stroke. Now you have changed your mind, again. Can we just agree that we really aren't sure of the lubrication situation in a four stroke? So far, my conversions seem to work. I hope to get much more flying time in next month and report my findings. Further, we haven't really defined the lubrication needs for model engines two or four stroke

Did you see that Henry Nelson was running 5% synthetic lubricant in F2C diesels back in the 80's? Why did this engine survive? Treven recently posted his findings of the OS .40 LA two stroke and it seems to be fine. Theoretically, the lubrication situation seems awful, reality seems a bit different.