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 $21 for a conventional oil change (up to $41.99 value) 2  $30.99 for a synthetic blend oil change (up to $61.99 value)  $45 for a full synthetic oil change (up to $89.99 value)