There are lots if differant oils out there and since its not food grade you can bet that its going to be the cheapest they can find , this is a very broad maket , starting at the bottom the waste both vegi & animal renant[boiled down falt] are used to some degree in most that you would find at a pump . just like dino oil by the time it reaches the pump its a blend from ever where . and changes over time , the refinrees go through prosses that make the end product pass the standards , basicly what Im getting at is like stated above a lot of veritiy , buy a bottle of olive some brand but differant grades , virgin , extra virgin ect. set them out side and they all have differant gell points , then you can get into who knows what somebody is putting in the tank , bad batch , water, corrupt methods none prossesed waste crankcase oil , and thats if you don't go into Mexico ect. These are good reasons for a mod. for the fuel systems that are out there we need to protect ourselfs , I was thinking of something along the lines of a dualbypass like Amsoil uses for motor oil.