Have investigated the Swepco products, and have used them in our Nortechs, they have allowed substantial hp gains, less fricttion, and better fuel economy. They allow engine to maintain full hp capacity versus other oils, SeveraL OEM'S ARE NOW USING IT. Nortech is using it exclusively in all there motors, and are getting better performance and longevity. They also make a Torco type drive oil that works awesome, gas additives, etc. I believe this will be the oil of the future for performance engines.Has anyone else had any experience with their products. We have taken on the dealer at loto and midwest area. It works and is reasonably priced . jim midwest performance marine-