The Valvoline Premium Blue SAE 10W-30 Diesel Engine Oil is a synthetic blend designed specifically for diesel engines. With a viscosity rating of 10W - 30, this oil provides optimal protection and performance. Made in the United States, this high-quality oil is ideal for enhancing the longevity and efficiency of diesel vehicles. The case of 3 one-gallon bottles ensures that you have an ample supply for regular maintenance and tune-ups.