Fuel Additives

[WardL]

I'm biased because I worked in the refining and marketing business as a fuels engineer for 37 years. Most aftermarket additives are not needed in fuels. There are a few refineries that produce fuel that will turn dark over the winter. The dark fuel will still perform fine, but esthetically it looks scary. If you think you can tell a difference in performance with one tank of gas you are kidding yourself. If it makes you "feel" better, then maybe it is worth it to you, not your engine. Sorry to pick on Bxx1, but a perfect example of feeling better.... Ford has a test where they add a small amount of motor oil to gasoline to foul up the injectors quickly for testing purposes. Since you don't have injectors, oil in the gas probably doesn't do any harm. Not sure, but would guess the octane of motor oil is -100 or so.... Interesting that gasoline additives in 1965 were all about increasing the octane (like lead). Since about 1985 all gasoline is required by the EPA to have additives to keep the injectors clean. So when you pull up to the Techron pump in your Cobra, you are wasting your money, unless you have injectors. Retail brand additives today have nothing to do with octane, they are all about keeping inside of engine clean. 99.9% of automotive gasoline sold at retail is 10% Ethanol. Racing fuel has MORE Ethanol/Methanol. Avgas as zero Ethanol. As always, IMO....