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.
Subject: A synthetic oil change shouldn't cost twice as much! Regular oil currently sells for around $4 a quart and synthetic oil is around $6 a quart. The cost of the oil filter and the cost of the labor are exactly the same. A complete oil change for most vehicles requires a maximum of 5 quarts.