2006 Jeep Grand Cherokee Owner Manual SRT8 - Page 303

MAINTAINING YOUR VEHICLE 303 NOTE: Under no circumstances should oil change intervals exceed 6,000 miles (10 000 km) or 6 months whichever comes first. Engine Oil Selection For best performance and maximum protection under all types of operating conditions, the manufacturer only recommends full synthetic engine oils that are API rated as SM/CF and meet the requirements of DaimlerChrysler Material Standard MS-10725. Use Mopar or an equivalent oil meeting the specification MS-10725. The manufacturer recommends the use of a full synthetic engine oil, such as Mobil 1௡ SAE 0W-40 or equivalent. Engine Oil Viscosity Chart 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. Materials Added to Engine Oil The manufacturer strongly recommends against the addition of any additives (other than leak detection dyes) to the engine oil. Engine oil is an engineered product and it's performance may be impaired by supplemental additives. 7