The D-A Reliant Heavy Duty Diesel Engine Oil is a synthetic blend designed specifically for diesel engines. With a viscosity of 15W-40, it provides the necessary protection and lubrication for heavy-duty vehicles. Manufactured by D-A Lubricant Company in the United States, this oil comes in a convenient 5-gallon pail and is labeled with the manufacturer part number 52108. Perfect for ensuring the longevity and performance of your diesel engine, this oil is a reliable choice for any automotive maintenance and service needs.