2008 Dodge Ram 2500 Pickup Owner Manual Diesel - Page 417

MAINTAINING YOUR VEHICLE 415 Engine Oil Viscosity (SAE Grade) Use SAE 15W-40 Engine Oil that meets DaimlerChrysler Materials Standard MS-10902 and the API CJ-4 engine oil category. Engine oil not designated by the DaimlerChrysler or Cummins௡ Material Standards and API CJ-4 should not be used, engine and exhaust system durability may be compromised. For lower temperature operation SAE 5W-40 engine oils may be used. These oils must meet the same requirements as stated previously. The engine oil filler cap also shows the recommended engine oil viscosity for your engine. For information on engine oil filler cap location, refer to the "Engine Compartment" illustration in this section. Synthetic Engine Oils You may use synthetic engine oils provided the recommended oil quality requirements are met, and the recommended maintenance intervals for oil and filter changes are followed. Materials Added to Engine Oil The manufacturer strongly recommends against the addition of any additives (other than leak detection dyes or lube odorants) to the engine oil. Engine oil is an engineered product and it's performance may be impaired by supplemental additives. NOTE: The manufacturer offers a lube odorant (Mopar௡ Diesel Fresh) for diesel engines crankcases. The lube odorant is recommended by the manufacturer to reduce the sulfur smell that may occur during engine idling. 7