PETROFLO 20W-50 HEAVY DUTY DIESEL ENGINE OIL, is a premium quality, high performance, fleet engine oil designed for use in on-highway diesel trucks, off-highway diesel equipment, heavy-duty applications and operating environments in the trucking, construction and agricultural industries as well in passenger cars and light trucks with diesel engines. Its formulated with advanced additive technology to provide outstanding wear protection and bearing corrosion protection. High detergency/dispersancy and a high alkaline reserve (TBN) provide extra protection in extended drain or severe service intervals.