Talking with my gear head neighbor the other day. He said that he always puts some ( A few ounces ) of ATF in the gas tank when he fills it up. He says the stuff is very similar to the chemistry of Marvel mystery oil... but obviously much cheaper to buy. Does anyone know if that’s true or not? I was thinking of putting a little two cycle oil in with my gas when I fill up… Not a lot, just a couple ounces per tank. Thought it might offset the ethanol when I can’t get to the good stuff. Also, If you put some ATF in a crank case to loosen a sticky valve, wouldn’t you have to change the oil very soon after that?