2008 Dodge Ram 2500 Pickup Owner Manual Diesel - Page 416

414 MAINTAINING YOUR VEHICLE Never operate the engine with oil level below the "ADD" mark or above the upper "SAFE" mark. Change Engine Oil (6.7L Diesel Engine) Follow the 6.7L Diesel Maintenance Schedule for recommended engine oil change intervals. Engine Oil Selection (6.7L Diesel Engines) For best performance and maximum protection under all types of operating conditions, the manufacturer only recommends engine oils that are API CJ-4 certified and meet the requirements of DaimlerChrysler. Use Mopar௡ or an equivalent oil meeting DaimlerChrysler Material Standards MS-10902. Products meeting Cummins௡ CES 20081 may also be used. The identification of these engine oils are typically located on the back of the oil container. 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 CJ-4 certified engine oils. Oils with a high ash content may produce deposits on valves that can progress to guttering and valve burning. A maximum sulfated ash content of 1.00 mass % is recommended for all oil used in the engine. The same oil change interval is to be followed for synthetic oil as for petroleum based oil. Also, synthetic oil must meet the same performance specifications as petroleum oil.