Mobil Delvac 1220 is a Mono-grade heavy duty diesel engine oil. Delvac 1200 series oils are a mixed fleet diesel engine oil line manufactured by Mobil Lubricants. These mono-grade or straight weight engine oils can be used in over-the-road diesel trucks, off highway diesel equipment, farm tractors, and passenger cars and light trucks with diesel and gas engines. Although Mobil Delvac 1220 has the additive formulation found in engine oils, this particular grade is mainly used in air compressor applications. 20 is the thickness of the oil based on Society of Automotive Engineers (SAE) standards which equates to 20w-20 or an ISO VG 68.
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