2005 Dodge Magnum Owner's Manual - Page 285

MAINTAINING YOUR VEHICLE 285 Engine Oil Viscosity (SAE Grade) - 2.7L Engines Engine Oil Viscosity Chart - 3.5L Engines The proper SAE viscosity grade of engine oil should be selected based on the following recommendation and be within the operating temperature shown in the engine oil viscosity chart. 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. 3.5L Engines Lubricants which do not have both, the engine oil certification mark and the correct SAE viscosity grade number should not be used.