I searched and read, and didn't find anything. How much oil for an Enya 19 IV? How much of it can be synthetic?
I have GMA fuel -- is 11/11 synthetic/castor enough?
Failing that, I'd like to be able to just buy fuel at the LHS and bring the total oil up to 25% with castor, but at best this will leave me with about 1/3 castor and the rest synthetic -- will that be enough?