Hydraulic oil worked for me for a while, as did Synthetic mineral oil from a group of air compressors.
Veggi oil worked, tranny fluid worked, as did some of this Soy Biodiesel they sell around here. I'm still using motor oil, if i ever get around to processing more of it.
Propane is my thing now. As a power additive. I'm getting excited about using it with my wmo. I've been reading about CNG and 100% propane, but thats for my gas vehicles. I've put my poor truck through too much already
