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.
Auto experts say synthetic oil provides the following benefits: - Long-lasting. Synthetic oil takes longer to break down and is designed to last for 7,000 to 10,000 miles or more between oil changes. Conventional oil should generally be changed every 3,000 to 5,000 miles. - Fewer trips to the auto mechanic can result in reduced costs overall for oil changes and fewer air filters.