Mobil Special™ Oils are formulated from quality base stocks combined with modern performance additives to give your engine the protection and the performance you expect under a wide variety of operating conditions. Mobil Special Oils are available in five multi-viscosity grades: SAE 5W-20, 5W-30*, 10W-30*, 10W-40, 20W-50. Mobil Special 5W-20, 5W-30* and 10W-30* meet the warranty requirements where an American Petroleum Institute (API) certified oil is specified. These viscosity grades are also classified by API as “Resource Conserving” engine lubricants, and meet or exceed the latest industry specification ILSAC GF-5 / API SN. Those claims are backward compatible with earlier performance levels such as API SM, SL, and SJ and previous ILSAC categories.