The Cerma Engine Value Package for Diesel engines offers unmatched protection, performance, and savings for your vehicle. With the Cerma Protocol, simply add the Cerma Engine Treatment, drive for 1,500 miles (or until the next scheduled oil change interval), and change the oil using Cerma Motor Oil. Follow this protocol with the products in our value package and see, hear, and feel the difference in your engine's performance. Your engine will run smoother, quieter, and have extra horsepower while also benefiting from longer oil life, protection, and increased fuel economy. It's important to note that larger diesel engines like trucks and semis require driving a minimum of 3,000 miles prior to the oil change. Don't add treatment and oil at the same time! Take advantage of the value packages and savings available for a limited time only.