The Cat 515-3973 DEO-ULS 15W-40 Engine Oil is a high-quality motor oil designed for diesel engines. Made by the trusted brand Cat, this oil has a viscosity rating of 15W - 40, making it suitable for a wide range of temperatures. Each jug contains 1 gallon of oil, and this case of 4 ensures that you have an ample supply for your vehicle. Manufactured in the United States, this engine oil is formulated to provide excellent performance and protection for your engine.