Red Line developed this 10404 40WT 15W40 Synthetic Race Oil for competition vehicles, from 11,000 HP nitro engines to class-style applications in all forms of racing. Their lineup spans everything from a 5WT race oil all the way up to 70WT nitro oil. This oil comes reformulated for improved frictional properties, with special detergents for improved lubricity and less detonation. It features no less than 2200ppm of zinc and phosphorus for antiwear, along with improved startup protection, lower oil temperature and cleanliness. This multi-grade race oil offers 2-4% more power than oil of a similar viscosity! This 15W40 oil is ideal for racing engines with wider bearing clearances, and is popular with sprint and midget applications on methanol, offering less frequent oil changes due to less fuel dilution. Red Line Oil: Born in a lab and proven on the track! Red Line 10404 40WT Race Oil Features: Oil Type: Synthetic Oil Weight: 15W40 Additive: ZDDP Oil Volume: 1 Quart Quantity: Sold Individually Red Line Oil Corporation manufactures more than 100 quality products, including motor oils, gear oils, assembly lubes, and fuel additives. Its popular WaterWetter coolant additive is widely used in the automotive, motorcycle, marine, and industrial markets.