The Cat 515-3985 DEO-ULS 10W-30 is a high-quality diesel engine oil designed for ultra-low sulfur vehicles. Made by the trusted brand CAT, this oil is specifically formulated for diesel engines, providing optimal lubrication and protection. With a viscosity rating of 10W - 30, this oil is suitable for a range of temperatures and conditions, ensuring smooth and efficient engine performance. The 1-gallon package is convenient for handling and storage, making it a reliable choice for maintaining your vehicle's engine health. Made in the United States, this diesel engine oil meets the highest standards of quality and performance.