Prepare your truck to be Ready for the Road Ahead™, with the Mobil Delvac™1300 SAE 15W-40 Premium Synthetic Blend Diesel Engine Oil 1-Gallon that provides maximum engine protection. Due to its specialized mix of quality base elements, this replacement formula defends against oxidation while resisting oil breakdowns. Developed to keep motors in prime condition by sealing microscopic spaces, resulting in improved fuel economy and reduced engine wear. FleetPride is your First Click in Heavy Duty®.