Part of the complete Mercury Fuel Care System, Quickare Fuel Treatment 8M0047930 offers professional-quality protection for your engine. It's formulated to maximize engine performance with all grades of gasoline, while helping to prevent corrosion, gumming, varnish build-up and even phase separation associated with ethanol-blended fuel. Quickare can be used at every fill-up in all 2‑stroke and 4-stroke carbureted and fuel‑injected gasoline engines. Use it to help prevent fuel-related issues in cars, trucks, motorcycles, ATVs, snowmobiles, marine engines, lawn mowers, chainsaws, string trimmers and snow blowers. Safe for catalyzed engines. 1 ounce treats 10 gallons of fuel.