I swear by the stuff. I've used it here at my car lot and on my personal stuff for about a year and a half when you could only get it at a few places, and I have always been very impressed with it. We bought a bass boat with a 75 horse evinrude outboard motor that had sat for 3 years. The gas had turned to varnish and the thing wouldn't even fire. We drained the gas, put fresh high octane in, and ran seafoam straight into the carbuerators, after about two minutes of turning over the first carb came in, then the second, then the third, in about 10 minutes the motor was running like a new one. We took it down, put it in the water and it ran 58 mph the first time out in three years with no hesitation what so ever. Definately a thumbup product.