Mobil Delvac Modern 10W-40 Super Defense V1 is an advanced synthetic technology extra high performance diesel engine oil engineered to provide outstanding lubrication to modern, high performance diesel engines used in severe on and off-highway applications. This diesel engine oil is designed using high performance base oils which provide excellent low temperature fluidity, high temperature viscosity retention, volatility control, and fuel economy improvement. These base oils are enhanced with an advanced additive system, which provides a high level of protection to all parts of the engine. Mobil Delvac Modern 10W-40 Super Defense V1 is engineered to provide long oil drain intervals in modern diesel engines.