Don't get me wrong, I am not going to use the Slick 50, but I just went downstairs and pulled out a gallon of Nitro. On the label it said "Contains a chemical that in the state of California is known to cause cancer". I bet that this fact is not going to keep your from the flying field sniffing those fumes. Also it carries a warning that states that it may cause blindness. Neither one of these statements are on the box of the Slick 50. It is also interesting to note that on the side of the Slick 50 box it states "compatible with all motor oils, will not void manufacturers' warranties, will not clog oil filters and works in all gasoline engines foreign and domestic. You would think that if they are making false statements they would really be liable. I am not defending Slick 50, but I am just a little leary sometimes of what manufacturers state especially in an economy that thrives on things that are built to break. Just like the looming oil shortage and yet we build monster SUV's that suck it up. I have a friend that has owned an engine rebuilder shop for the past 30 years. I will check with him tonight and see what kind of evidence he has seen. It is not in either of my vehicles. I know now that it is not compatible with glow plugs and so I won't be using it in my 2 stroke, but I am curious and will get first hand info on what it really does.