Using your vehicle for work is one way to rack up the wear and tear. Just ask Brian Murphy. The Chicago-based delivery man has put more than one million miles on his 2007 Nissan Frontier - an equal distance of two round trips to the moon. A testament to the pickup truck's build quality, it's still running on the original four-cylinder engine and five-speed manual transmission. Murphy owes the longevity to changing the oil every 10,000 miles. However, there is one part that is no longer working. The Frontier's odometer stopped ticking at 999,999, so Murphy now keeps track using the trip meter. What maintenance tips do you have to keep your car going?