Looks like some great results in terms of reducing waste, and achieving higher ROI. By removing the emphasis from "changing" the oil, and doing proper maintenance/monitoring in other aspects of the engines, they are achieving higher overall reliability than maintenance regimes that were obsessed with the relatively short manufacturer-recommended drains.
Hart began researching oil, oil additives, and filters in an attempt to reduce downtime. In 2010, he began making changes. The fleet purchased an oil analysis machine, switched to extended performance oil filters, and began using full synthetic oil. This allowed the fleet to extend filter changes to 10,000 miles and oil changes to 30,000 miles. Previously, it changed oil in pursuit vehicles every 5,000 miles and on administrative vehicles every 7,500 miles.