Gas engines are super simple.. pump gas like what would be put in your car, and some 2 cycle engine oil mixed in the right ratio (i.e. 32:1), the same kind of stuff that you put in a weed wacker or chain saw.. my old man runs his with Stihl ultra or something like that.. good stuff and synthetic i think.. some guys swear by synthetic, others say it doesnt matter.. Iam of no opinion either way.. but can afford the synthetic oils..