Well, here's my 2 cents worth. I have a Porsche and some of the forum members recommend SeaFoam when you have a little blue oil puff on start up or a stickey lifter. I would get the blue oil puff when I let it sit for 2 weeks. After SeaFoam treatments haven't seen anything. Probably start using it in the America once a month just to keep the combustion clean. Now for gas...back in th 60's with leaded gas you never had problems. Good old hi-test was the best, expensive though, .19 cents American White, Sunoco Blue 260 .21 cents and .23 cents for Sunoco 280. Used the 280 at the drag races. That would be pertty close to NASCAR racing fuel.
