2004 Dodge Ram 3500 Pickup Owner's Manual - Page 332

332 MAINTAINING YOUR VEHICLE • SAE 5W-30 is the preferred oil for Dodge Trucks with 3.7L/4.7L/5.7L engines. • Lubricants which do not have both the engine oil certification mark or current service symbol and the correct viscosity grade number should not be used. Synthetic Engine Oils There are a number of engine oils being promoted as either synthetic or semi-synthetic. If you chose to use such a product, use only those oils that are API Certified and meet the SAE viscosity standard. Follow the service schedule that describes your driving type. Materials Added to Engine Oil The manufacture 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. Disposing of Used Engine Oil And Oil Filters Care should be taken in disposing of used engine oil and oil filters from your vehicle. Used oil and oil filters, indiscriminately discarded, can present a problem to the environment. Contact your dealer, service station, or Preferred Viscosity for 3.7L/4.7L/5.7L Engines