Description Product OverviewHarvest King Full Synthetic All Fleet SAE 5W-40 HD Engine Oil is engineered for high-performance diesel engines, delivering enhanced fuel efficiency and long-lasting protection under extreme operating conditions. This advanced formula helps maintain emission control system durability and offers superior performance at high temperatures. Packaged in a 2-gallon container for versatile use across fleet and industrial applications.Key BenefitsImproves fuel economy compared to SAE 15W-40Effective at sustaining emission control system durabilityExcellent high temperature protection and reduced engine wear2 Gallons