Metal Lube Engine Treatment, Anti-friction 8 Oz Lengthen the lifespan of your engine Prevents wear caused by high temperatures in summer and low ones in winter Metal Lube is not lost during an oil change Reduces noise caused by friction between metals. For engines that use from 4 to 6 US qts. (4 to 6 liters) of oil. Pour content into ENGINE oil. Repeat application every 60,000 miles (110,000 km) or once a year for best results and maximum protection.