How to keep high-mileage vehicles on the road
Even when everything is running smoothly, maintaining a fleet of high life-cycle heavy duty trucks is no easy or inexpensive task.
However, with the API [American Petroleum Institute] category change from CJ-4 to CK-4, high life-cycle heavy duty rigs using CK-4 oils can stay on the road longer by reducing the amount of costly downtime, extending oil drains and, most importantly, enhancing fuel economy.
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Source:: http://fleetowner.com/blog/how-keep-high-mileage-vehicles-road
