Diesel fuel comes and goes but your truck has to stay the same. After the introduction of Ultra-Low Sulfur Diesel in 2006, today's diesel trucks have had to deal with their moving parts getting less lubricity than what they need. Lower lubricity means more wear and tear on everything your fuel touches which can result in costly repairs. Get back that lubricity and protect your engine with Hot Shot's Secret LX4 Lubricity Extreme! How does it work? When Ultra-low Sulfur Diesel was created it removed much of the sulfur that causes pollution from engine exhaust. The thing is, it also removed a lot of the oxygen and nitrogen from the fuel as well. It's those two elements that LX4 Lubricity Extreme adds back into your fuel so you get enhanced lubricity (up to 56% more) without adding back anything harmful to the environment. Protect your fuel pumps and injectors, extend your fuel life, and reduce pintle scoring and wear with Hot Shot's Secret Diesel Fuel Additive LX4 Lubricity Extreme in your tank. SPECIFICATIONS & DOSE SIZE: Diesel Fuel LX4 Lubricity Extreme 40 GAL 4 OZ 80 GAL 8 OZ 160 GAL 16 OZ