Before I went off and made a statement about what I have been running the last month in my fuel, I wanted to completely test it first. Since I ride motocross, I have two five gallon jugs that I fill with fuel once a month, and just gas up the bike from home. Hate gas stations. I added Lucas Upper Cylinder lubricant to my fuel. Lucas is the only brand of additaves I trust. I added 4 oz. to ten gallons of fuel. The recommended amount was 3oz. That seemed a bit low. It's very oily. Immediately I noticed that the engine internals were much quieter at every rpm. On the freeway, the engine has a definate smoother feel. I also noticed that I had to turn my idle down some, it went up, maybe because the mixture, or a slicker surface and the piston moves easier. There is no smoke, no smell, and absolutely no deposits on my plug. Actually this stuff is supposed to clean off carbon and other deposits. They claim an increase in power(I did feel some) and a increase in fuel mileage. I didn't really notice any, but maybe it did. The engine temp went down about 10 degrees, verified with a infared temp gauge, right at the cylinder, but there are just to many variables to be certain of that. Since it lubricates the entire fuel system the lubricant has fuel stabilizers in it to prevent varnish and deposits in the carb. I am stuck on it now. Just wanted to pitch it out there to you guys. I purchased it at Pep Boys, but now I forgot how much it was. Somewhere around 10 dollars if I remember right. That treats 100 gallons. Let me know your thoughts. BTW I was testing it in my low mileage 2008 DRZ400 SM. I now run the stuff in my MX bike. I also believe that I will see much more mileage before a rebuild is in order with continued use.