Marvel Mystery oil has been around for many many years. probably since the 1920 or 1930's. I dont know for sure how long. it just seems as though I've seen oil can collectors with mystery oil cans in collections claiming to be that old. anyway, about the oil, Marvel does claim that adding a few ounces to the gasoline, or the oil, will help the engine just as u describe. there used to be a lot of old timers in my family that have long since passed away that used Mystery oil regularly in their fuels for farm tractors, sawmill engines, hit-and-miss engines and their cars and trucks of long ago. The only thing I can say about it is that when I was just a boy, and these old guys were still alive, anytime that there was a family gathering and the men got around to talking about their equipment, one topic was always about how smooth their engines ran and how well they fired up and whoose tractor could pull the biggest tree stump out of the ground. Many of them were hand crank engines and almost all of them were quite old, well used, but well serviced and taken care of at the same time. I do remember these engines running smooth and strong. I still have a 1945 WC Allis-Chalmers tractor and a 1940 B Allis-Chalmers that were regularly fed Marvel Mystery Oil back in the day by my grandfather and both run very well to this day. as far as using mystery oil in a modern four stroke, unleaded fueled, fuel injected, computer controlled, push button started, device that we lovingly know as our motorcycle engines today? I dont think I'll be adding any oil of anykind to the gas that goes in my air cooled 2008 Harley. it cant be real good for fuel injectors or the fuel pump inside the tank or the fuel pressure regulating device. On the other hand, I do ocassionally (about every third oil change) put a little Marvel Mystery Oil in the gas tank and the oil on my old 1993 Jeep Wrangler. My Jeep is fuel injected. The Jeep has slightly over 195,000 miles on it. This Jeep uses less than a quart of oil between oil changes, does not blow any smoke, runs strong and smooth and gets 21 MPG in town where its driven mostly. It has the 4.0 H.O. inline sixbanger engine. I think that for an older, possibly less technologically advanced engine or components, Marvel Mystery Oil could still be a good thing. Even if this older engine and it components were completely rebuilt or remanufactured to new specifications and was introduced to Mystery Oil for the first time directly after breaking in the new rebuild, however, I dont think that it would be a good idea to use additives in the latest greatest most advanced engines and fuel delivery systems that we have today.