XLP Gas Fuel Additive 15 Ounce Bottles (Case of 4) Is the gas you buy dirty? The simple answer is YES! By using XLP gasoline fuel additive, you clean the injectors and valves, which improves the efficiency of your vehicle's fueling system. XLP even goes a step further by including a friction reducer. As you use this product, the friction reducer coats the cylinder walls reducing the upper cylinder friction while some of it survives combustion and accumulates in your engine oil to coat the internal moving parts. As a result, you reduce the internal friction that might otherwise rob your engine of optimal fuel performance. You'll notice the improvement in total miles you can drive on each tank of gas. For initial clean up, pour 3 ounces into 10 gallons of gas to clean the deposits and build up out of your fuel system. Once the initial tank of gas is used, maintain your vehicles "like new" performance by using 1 ounce per 10 gallons of gasoline. Made proudly in the U.S.A.