Diesel truck owners, listen up! This Opti-Lube Summer+ Cetane Formula Diesel Fuel Additive is pretty much a game-changer for your engine's performance. Each quart bottle treats up to 640 gallons of diesel fuel, and this case gives you 12 quarts to keep you going for a while. There are so many benefits to using this stuff - it increases lubricity to protect your fuel system, improves your fuel mileage so you save money at the pump, keeps your tank clean, and enhances your truck's overall performance. Over time, build-up and residue can gunk up your fuel injectors, which really decreases your truck's efficiency. This additive lubricates those fuel injectors to reduce fuel system wear while cleaning out existing deposits and preventing future build-up. It also fights against rust and corrosion to keep your vehicle in pristine condition. The cetane boost is impressive too - it increases cetane by 5 to 7 points, which means better cold starts, reduced engine noise, and more complete fuel combustion that commonly results in increased MPG. Made specifically for ultra-low-sulfur diesel (ULSD), this formula is perfect for summer months when higher temperatures can cause faster thermal degradation of your fuel. It actually more than doubles the storage life of standard diesel fuel. When you add Opti-Lube to your tank, you'll notice your engine runs more smoothly and efficiently almost immediately. It's compatible with all vehicle emissions systems and works as a demulsifier to separate water from diesel fuel. If you want optimal performance from your diesel engine while saving money on fuel, this additive is definitely worth trying.