if anything they are only a tiny bit better than the other oils out there. I've tried it, saw no difference in my fuel economy, and I am crazy about this stuff. I see a difference everytime I do maintenance. But never found any with any amsoil changes. And I got news for you guys. Any synthetic will run 25+k miles without an oil change. Not just amsoil. Just amsoil would rather charge you more, give you less oil, unlike the others who try to get you to buy it more often toi make the same money. Just because an oil is black, doesnt mean it's bad. that's just the detergents doing its job. It's still just as lubricating. Find out for yourself. Run both oils, get them tested as you go. You'll find they both go good for the same amount of mileage.
