Before this big, bad pickup arrived, manufacturers largely used upgraded versions of their light-duty trucks to handle heavy-duty work. The 1999 Super Duty was a separate model line with its own style and hardware underneath.
You can run a conventional oil 5K miles but you should be able to run a synthetic oil 7500 to 10000 miles. Royal Purple API-licensed synthetic engine oils allow motorists to travel as many as 12,000 miles as the recommended oil change interval.
Advances in oil chemistry and engine technology and an increased use of synthetic oil have lengthened oil change intervals significantly. For 2013 models, autumakers advise drivers to change their oil every 7,500, 10,000, or even 15,000 miles. The shortest oil change interval is 5,000 miles but only in some Hyundai and Kia models. However, the car service industry continues to tell customers that they need to change their oil twice as often.