Synthetic Blend; Super Heavy Duty Engine Oil; SAE 50W; Straight 50 Super heavy duty synthetic blend formula provides strong protection for diesel and gasoline engines where a single SAE grade is recommended. Superior high temperature stability, wear protection, and engine cleanliness, high TBN. Exceeds API service CF, CD/SL, SJ. 5 gallonsBrand InformationMystik has produced quality lubricants since 1922 for every major U.S. industry, from farming, petroleum, mining and automotive to trucking, textiles, construction and food processing. Each industry benefits from the dependability and long service life of high-quality Mystik lubricants. Trust a decades-long commitment to quality, durability, cost-effectiveness and reliability.