Engen Xtreme 5W-40 is a unique, synthesized “long life” engine lubricant which exceeds most existing passenger car engine oil requirements, including the demands of highly stressed turbocharged and all multi-valve units. It is fully approved by the internationally recognized American Petroleum Institute's Engine Oil Licensing and Certification System, carrying the full “DONUT” approval for API SN/CF performance level. Its excellent high and low temperature characteristics provide excellent wear protection under all operating conditions especially at start up when the most wear occurs in an engine.