Royal Purple XPR (Extreme Performance Racing) oils are recommended for use in various racing applications, and are popular in a variety of motorsports including: NASCAR, NHRA, World of Outlaws and Bonneville Salt Flats. Contains Royal Purple's proprietary Synerlec additive technology. PERFORMANCE ADVANTAGES Greater wear protection on startup. Increased horsepower. Extends equipment life. No flushing required when switching from other synthetic engine oils or conventional engine oils. Non-foaming. Outstanding rust / corrosion protection. High-temperature service capability. XPR resists displacement, dilution, and emulsion caused by exotic fuels, such as alcohol and methanol. XPR 20W-50is formulated for running extended periods under extreme pressure and heat. It is used in oval track, marine and drag racing and is very popular in sprint cars, late models, truck pullers and bracket racing. 6 Quarts.