Mobil Delvac 1240 motor oil is a heavy duty, diesel engine oil formulated from high performance base oils and a balanced additive system of ashless dispersants, metallic detergents, and inhibitors to control oxidation, wear, corrosion, and rust. They are used in a wide range of applications where a monograde lubricant is recommended including 2-cycle diesel applications (e.g. the Detroit Series 53, 71 and 92 two-cycle engines).