There's no doubt a diesel engine can live a long life, but running a good quality oil is definitely an important part to a strong running engine. Amsoil announces its new upgraded Premium API CJ-4 Synthetic 5W-40 Diesel Oil for extended service life. This premium diesel oil for model year 2007 and newer heavy-duty and pickup truck diesel engines is formulated with the latest additive technology and the most advanced synthetic base oils. Helping resist breakdown, it can be used for an average of three times the OEM oil drain interval. It's compatible with all exhaust treatment devices and its low sulfated ash formula is designed to extend the service life of diesel particulate filters. Call Amsoil at (800) 777-8491 or www.amsoil.com.