Genuine Caterpillar DEO-ULS 15W-40 Multigrade Engine Oil, supplied in a 1-gallon (3.785 L) container. This Ultra Low Sulfur (ULS) engine oil is specifically formulated to provide superior protection and extended drain intervals for Cat diesel engines and other heavy-duty diesel engines. It meets stringent specifications including Cat ECF-3, API CJ-4, API CI-4 PLUS, API CI-4, and API CH-4, ensuring optimal performance, reduced wear, and engine longevity in a wide range of operating conditions.