I have used Seafoam and StaBill for many years and both products are great when used as recomended. The gasoline we use today is a different formula with different additives than we had years ago. Todays gas will go bad sometimes in less than four months. I have had problems especially in stand by generators, lawn mowers, and chain saws. The biggest problem seams to be gumming in the float bowl and hard starting even after carb clean out. When I use StaBill I have no problems in this area. I use it with diesel and gasoline in bachoe, bobcat, road tractors, farm tractor, PU, cars, saw mill power units, motorcycles (5). gemerator, saws, mowers, and blowers.