Earl and Locktite Is you look at fuel formulas (castor) the old paw is the 30/30/30 bit- MVVVS ranges from 10% parrafin oil 10% castor mix for racing this could lower engine life?? do not think so still 20% oil they show
but they upped the kero to 47%, on this one for racing I would say 20% castor is safe 15%?? you must have some coming out the pipe this assures

plenty of lube htey show 3% IGN improver Amyl nitrate in all except break in formula ether 49-Kero 32 castor 26

MVVS also shows a 25 castor 25 ether 47 castor ans 3% ignition improver for racing too in all this was in the MVVS 09D instructions
Using the Davis stuff 1/2A and ABC mixes have had no issues

I am not sure what the syn/castor % would be martin

a point this is a classic MVVS iron piston the newer ones ABC AAC would most likely be fine on 15% oil














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