From my 2016 RAM owner's Manual - Diesel Supplement for 2500/3500/4500/5500
Oil Change Indicator System — Cummins Diesel
Your vehicle is equipped with an engine oil change indicator system. This system will
alert you when it is time to change your engine oil by displaying the words
Your authorized dealer will reset the oil change indicator message after completing the scheduled
oil change. If a scheduled oil change is performed by someone other than your authorized
dealer, the message can be reset by referring to the steps described under “Electronic Vehicle
Information Center (EVIC)” or “Driver Information Dis- play (DID)” in “Understanding Your
Instrument Panel” for further information.
Replace the engine oil and oil filter every 15,000 miles (24 000 km) or six months, or sooner if
prompted by the oil change indicator system. Under no circumstances should oil change
intervals exceed 15,000 miles (24 000 km) or six months, whichever comes first.
NOTE:
Under no circumstances should oil change intervals exceed 15,000 miles (24,000 km) or six
months or 500
Hours, whichever comes first.