2005 Chrysler 300 Owner's Manual - Page 293

MAINTAINING YOUR VEHICLE 293 American Petroleum Institute (API) Engine Oil Identification Symbol This symbol means that the oil has been certified by the American Petroleum Institute (API). The manufacture only recommends API Certified engine oils that meet the requirements of DaimlerChrysler Material Standard MS-6395. Use Mopar or an equivalent oil meeting the specification MS-6395. Engine Oil Viscosity (SAE Grade) - 2.7L Engines 2.7L Engines 7 SAE 5W-30 and SAE 5W-20 engine oils are recommended for all operating temperatures. These engine oils improve low temperature starting and vehicle fuel economy. Refer to your engine oil filler cap for the recommended engine oil viscosity for your vehicle. Lubricants which do not have both, the engine oil certification mark and the correct SAE viscosity grade number should not be used.