need an explication: I have an mvvs gas engine that runs well with 3% oil in fuel, I also have some glow engines that need 18% of oil, the most obvious difference between the gas and glow engines is the needle bearig on the big end's conrod on gas engines while glows has plain bearing. I also own a cmb 91 evo 2000 (glow) that has the crankshsaft bearigns one in front and the other in the back of the engine ( the crank journal is in the middle with roller needles). I am a little puzzled: why is not possible to use a fuel with low oil content (2/3%) in glow engines with a roller bearing on conrod?