V8 HD 40 API CH-4 is mineral diesel engine oil blended with premium base stock quality and advanced additive technology. it is specifically formulated for luxury diesel cars and modern heavy-duty diesel vehicles. and it is the optimal choice for fuel efficiency and superior performance in diesel engines. This oil meets or surpasses the industry’s most stringent standards and outperforms conventional oils. V8 HD 40 API CH-4 is specially formulated with FRICTION PROTECTOR TECHNOLOGY with the best engine protection from soots and carbon deposit control.