2010 Jeep Grand Cherokee Owner Manual SRT8 - Page 321

320 MAINTAINING YOUR VEHICLE requirements of Chrysler Material Standard MS-10725 The engine oil filler cap also shows the recommended and are approved to MB 229.3 or MB 229.5 (will be listed engine oil viscosity for your engine. For information on on the back label of the oil container). engine oil filler cap location, refer to "Engine Compartment" in Maintaining Your Vehicle" for further The manufacturer recommends the use of a full synthetic information. 5W-40 or equivalent engine oil. Synthetic Engine Oils CAUTION! You may use synthetic engine oils provided the recommended oil quality requirements are met, and the recomDo not use chemical flushes in your engine oil as the mended maintenance intervals for oil and filter changes chemicals can damage your engine. Such damage is are followed. not covered by the New Vehicle Limited Warranty. Materials Added to Engine Oil The manufacturer strongly recommends against the adEngine Oil Viscosity SAE 5W-40 engine oil is preferred for use in all operating dition of any additives (other than leak detection dyes) to the engine oil. Engine oil is an engineered product and temperatures. it's performance may be impaired by supplemental additives.