Old Fart just for you I have an OS 32sxh with ceramic liner and piston, good for around 16 to 17,000rpm (a bit slow) on 30% nitro in an 80% Bomber that if you can handle it you can fly it in Duration. Get onto Paul Baartz in WA and talk to him about it all. Tell him Trevor and Jim sent you. Castrol R in the speedway car and my early diesels was the oil of choice good stuff. My ether supplier has to sign his life away every time he gets us the stuff, lots of trading in it every easter.