Valvoline Diesel Extra engine oil is a 15W-40, premium quality heavy duty diesel oil that has been blended using quality mineral base stocks and modern technology additives to provide increased protection and performance in heavy duty diesel applications operating in severe service conditions. This oil offers excellent soot control, minimising oil thickening and promoting increased drain intervals. Valvoline Diesel Extra is recommended for use in European engines such as Volvo and Mercedes-Benz as well as American sourced engines from Cummins, Caterpillar and Mack. Meets API CI-4/SL specifications. To find the correct engine oil suggested for your vehicle; either add your vehicle to My Garage or check with your manufacturer, vehicle user manual, your local mechanic or head in-store and talk to one of our friendly team.