Frank,'
Around 1999 Paul Walker was using a Saito .56 so I tried one myself when Paul switched to Powermaster YS/20-20 I tried it. Then I tried it in my other piped engines . I found the All Synthetic fuel allowed the engine to rev higher , run cooler and didnt break or charge as hard as a 50-50 syn ,castor would .I've used 10,15 & mostly 20% nitro Heli low viscosity oil fuels. Some guys say all Syn wont allow their engine to run correct & it overheats,, . I wont debate what I have found so if Joe Bellcrank can't get things to work... he needs help in that area.
I like Byrons Heli , Powermaster YS-20/20 , Torco 20/20 Heli, Riches Brew Heli 20/20 low viscosity . I run the stuff in My piped ABCs, Stalkers , Double Star ringed , K&B .61 ,Merco .61 Tiger .60s. The only damage I've inflicked to my engines was from using an electric starter. I do however toss in a bit of castor when running my Mercos & Tigers.
John L.