Add to gasoline for better gas mileage. Lubricates like lead. Prevents sticking rings and valves. Improves compression. Reduces cylinder wear. Will not harm catalytic converters. Also add to crankcase to extend life of oil. Extra protection in hot and cold weather. Add 8 oz. per tank of gas or 20% of total crankcase capacity at oil changes. Perfect for marine engines. No. MM12R: Size: Pint, Pkg Qty: 1, Package Type: Bottle No. MM13R: Size: Quart, Pkg Qty: 1, Package Type: Bottle No. MM14R: Size: Gallon, Pkg Qty: 1, Package Type: Bottle Thanks for shopping Hipp Hardware Plus's Online Store for all your DIY and Home Improvement needs. Remember Hipps Help!