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.
1 We recommend replacing the oil and filter every 5,000 miles or four months. 2  Synthetic oil (versus regular) is cost effective. 3  Itâs lubrication properties are better and you will not need oil changes as frequently.