Here are Chrysler's MS-6395 oil specifications for its new engines: http://www.underhoodservice.com/engine-oil-specifications-101/ Chrysler has three proprietary oil specifications for gasoline engines. The MS-6395 specification covers 5W-20, 5W-30, 5W-20 and 10W-30 oils. This standard follows the API SM GF-5 standards with a few extra tests for Chrysler engines. Most GF-5 approved oils meet these standards. The MS-10850 specification is for SRT8, SRT10 and SRT6 engines that call for 5W-40 oil. MS-12633 approved oils are for SRT engines, like the 6.1, that specify 0W-40 oil.