Engen Xtreme 5W-40 is a unique, synthesized “long life” enginelubricant which exceeds most existing passenger car engineoil requirements, including the demands of highly stressedturbocharged and all multi-valve units. It is fully approved by theinternationally recognized American Petroleum Institute’s EngineOil Licensing and Certification System, carrying the full “DONUT”approval for API SN/CF performance level.Its excellent high and low temperature characteristics provideexcellent wear protection under all operating conditionsespecially at start up when the most wear occurs in an engine.