Muscle car traditionalists love Red Line's 10w40 Motor Oil, featuring high zinc like other oils from Red Line. Derived from Red Line's Race Oil line, but formulated specifically for street use in various passenger cars and light, medium and heavy trucks, Red Line Engine Oils outperform all petroleum-based oils and all other synthetics on the market today. Using only the most stable components available, Red Line oils are formulated for wear protection and friction reduction across a wide range of engine operating conditions. Red Line's products are unique because they contain polyol-ester base stocks, the only lubricants which can withstand the tremendous heat of modern jet engines.