I just read Clarence lee's test of the OS .30 fourstroke and found it interesting in that the instruction say that castor is the preferred lubricant and that synthetic is just OK. It looks as if the power is on par with my Saito .30 a 10x6 at 10,300. I guess a lot of guys are going to fuss about that castor being the preferred lube statement. When I first got my Enya .46 MKII and later a Saito .80 and 150, I ran them all on Fox 15% nitro fuel with 20% castor, all the horrible things people said would happen never did except for the mufflers getting brown. The valves did not.

I always run castor and yes my mufflers do get brown etc... but i still love that castor