Originally Posted by
Dave, FormerDairyFarmer
As an experiment I ran a Fox .25 with a Meehanite piston and an LA .65 bushing engine on the Wildcat full synthetic. There was no hint that the synthetic lube was not doing its job, in the long run, I don't know, but I suspect they'd be fine. I also ran an old SuperTigre .51 in which I had installed a new Frank Bowman ring, it ran fine. That's all I've run Saitos and an OS or two on for about 5 years.
For one I said that castor is thicker than most synthetics. But since the same engine will do fine with castor as well this is no proof that one is better than the other. Yes most engines will do fine with synthetic. With this type of testing you would have to run hard till the same model of engine is worn out on both oils.