Only use the best for your car when you use Bardahl! Our Full Metal Advanced Motor & Engine Oil Treatment is an ultra-concentrated zinc (ZDDP) oil that protects against oxidation and corrosion while our lubricating C60 Fullerenes lower operating temperature, guard against friction and wear, and even help restore compression over time. This is an advanced anti-wear friction modifier that extends the life of 4 stroke car engines while extending the life of your oil and increasing service intervals. We've created a 4 stroke engine oil treatment that is a low viscosity ultra-concentrated additive that makes sure your engine is giving you the best performance and taking the least damage. Our concentrated formula means that one 12 fl oz bottle of zinc additive is all the treatment you need for up to 6 quarts (5.7 liters) of motor oil. All you need to do is shake the bottle well, and pour the contents into a warm crankcase after the oil and oil filter has been changed. At Bardahl we've been creating the best additives in America from our headquarters in Seattle, Washington for over 85 years. We've made our name a trusted source for mechanics, car enthusiasts, and in the world of motorsports with our constant commitment to quality and innovation.