Mobil Delvac 1300 1-Gallon 15W40 CK-4 Super Diesel Engine Oil. It is an extra high performance oil that helps extend engine life in some of the most severe on & off highway applications while delivering excellent performance. Its soot viscosity control enables greater engine efficiency and long engine & oil life. Thermal & oxidation stability helps reduce engine deposits & sludge build up to keep engines running reliably. Enhanced TBN reserves improves corrosion protection & extends drain intervals for both new & old engines using either low 500 ppm or ultra low 15 ppm sulfur diesel fuel. It has low temperature pumpability, corrosive & abrasive wear resistance, and excellent oil consumption control that requires less make up oil during operation. It meets demanding specifications of key OEMs.