Adds Protection – Increases fuel lubricity by up to 56% for an added layer of protection that keeps fuel pumps and injectors from unnecessary damage or failure, and adds lubricity back to Ultra Low Sulfur Diesel (USLD) No Harmful Ingredients – LX4 is formulated without harmful solvents or alcohol making it a safe and effective fuel treatment for all systems and engines Extends Fuel System Life – Protects any fuel system from harsh ethanol or diesel fuels and maintains a smoothly working engine and fuel system, keeping it healthy for even longer Lubricates Upper Cylinder – Works with any gasoline, ethanol, or diesel fuel to lubricate and protect the upper cylinder and other key engine and fuel system components Versatile – Perfect for gasoline or diesel engines, LX4 can also be used with fuel stabilizers and fuel system treatments to keep your vehicle at peak performance