I've used Seafoam for years both to keep my fuel systems clean in cars, trucks, motorcycles, lawn mowers, chain saw, weed eater, etc. and for fuel stabilization over the winter. I used Stabil over the winter for years before starting to use Seafoam about 7 years ago. Especially in my lawn equipment and stored fuel, I had a terrible time getting them to start in the spring, and often I had to drain the fuel and add new fresh fuel to them to get them to fire up. Since I started using Seafoam, I've never had any problem starting any of them in the spring, and my motorcycles, which get used year round, I've never had a carb or fuel problem in them. I add a few ounces to a full tank on my bike about once a month as a routine, and when I fill up my gas can for the lawn equipment, I add a few ounces to it also. The stuff just plain works, all the time. I have heard that Stabil can actually cause some gelling of fuel with some of the newer formulas, especially ethanol mixes, but I don't know if it is true. I know first hand that Seafoam works great for stabilizing and for routinely keeping the fuel systems clean.