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.
Full Answer. Some cars can go as far as 15,000 miles with synthetic oil before needing an oil change. Therefore, car owners must read the specs in the owner's manual to determine how many miles they can drive before changing the oil is necessary.