Cast iron pistons need a careful run in...the hobby store gave you BAD advice. Rather than go through the details here it's better if you go to http://www3.telus.net/dieselcombat/breakin.htm which explains not only how to run them in but gives the WHY of it all. This sort of info isn't generally known in RC and I'm sure many Enya's will never get the life that they should have. I should add that I've got no idea what the Enya instructions say.

I'm sure someone will correct me if I'm wrong but I believe Byron mix by weight and not volume which makes the actual oil content around 17%....way too low. Powermaster and Sig both have a fuel suitable for an iron piston engine.