2008 Jeep Grand Cherokee Owner's Manual - Page 396

396 MAINTAINING YOUR VEHICLE Engine Oil Viscosity (3.7L/4.7L/5.7L Engines) SAE 5W-20 engine oil is recommended for all operating temperatures. This engine oil improves low temperature starting and vehicle fuel economy. The engine oil filler cap also shows the recommended engine oil viscosity for your vehicle. For information on engine oil filler cap location, see the "Engine Compartment" illustration in this section. NOTE: Vehicles equipped with a 5.7L engine must use SAE 5W-20 oil. Failure to do so may result in improper operation of the Multiple Displacement System (MDS). Refer to "Multi Displacement System" in Section 5 for more details. Lubricants which do not have both, the engine oil certification mark and the correct SAE viscosity grade number should not be used. Engine Oil Viscosity (3.0L Diesel Engine) CAUTION! Your vehicle is equipped with an advanced technology Diesel Engine and an emission device designed to limit Diesel Particulate Emissions from being released into the atmosphere. The durability of your engine and life expectancy of this diesel particulate filter emission device is highly dependent on the use of the correct engine oil. In order to protect your engine and emission system, use only SAE 5W-30 Synthetic Engine Oil that meets DaimlerChrysler Material Standard MS-11106, Mercedes Benz MB 229.31 or MB 229.51, and ACEA C3 qualified engine oils.