Well I'm a real skeptic(sp?) when it comes to these "miracle" products but I have to say that I am very impressed with this stuff. My daily driver(Nissan 240SX) has always had a stumble/miss at higher RPM (like when I was passing another car). I poured some Sea Foam in last week, drove the car one day, and the stumble is totally gone. It runs much smoother and feels like it has more power overall. I wouldn't use the stuff unless you have a reason too because it's a little expensive but if you have a hesitation problem or something like that I would highly reccomend it.