Mercury - Quickstor Fuel Treatment and Stabilizer Fuel System Additive Clean Storage Formula 8M0058682. Overview. Anyone who's winterized a boat or tucked it away for a few quiet months knows the uneasy feeling that comes with leaving fuel sitting in the tank. You want that peace of mind - the comfort of knowing your next start-up will be smooth and trouble-free. This Mercury Marine part helps provide exactly that. It keeps your fuel fresh, your system clean, and your boat ready for that first w