Long ago, I road raced two-stroke Yahamas (TZs) and we all ran Castrol R bean oil. But everyone said that bean oil "denatured" the high test gas we ran, so you had to drain it out after every weekend. For a while, I just burned it in my truck, but later got a more smog-controlled truck, and could not burn it. The solution was to burn Klotz race gas premix, which had a 50-to-1 bean oil. The Klotz guys said it was homogenized in 40,000 gallon batches, and would not denature. You still had to drain it out of the bike gas tank into the shipping cans, but at least you could keep it for the next ride. I see that Klotz no longer sells pre-mix with bean oil, but VP does sell premix. Don't know if the VP is bean oil or no. Bean oil was used when I was a kid for glow-plug airplanes. Then later for hare scramble racers, and still later for road racers. Some dirt-track sprint cars smell like they run bean oil. Bean oil smells fast.