I guess they are all flammable. Just figuring they are likely going to burn a little different. Figureit must adjust somehow so it aint running too lean or dumping smoke.
Waist oil will burn in the older diesel cars and trucks and no smoke but it will run hotter than diesel fuel. I've tried everything in an engine even made my own fuel.
Use to take canola seed and had a press to take the oil out of the seed and run that in all my diesel rigs, smells like French fries out the exhaust. I tried heating gas or oil to the point of vapor and running an engine on fumes and it works fine but I'm not one to figure out how to set timing and carb proper and overheated a few small engines. Ran crude oil in my car when I worked in the oil fields but that was the really good crude that our grand dads would call drip gas.