Basically, a certified pre-owned car is one that has gone through a series of tests, has met the manufacturer's requirements, and is backed by a limited warranty. Certified Pre-Owned cars have become very popular with not only buyers, but also manufacturers. Buyers love the fact that they don't have to worry about purchasing what could turn out to be a lemon, since manufacturers back their cars, and warranties secure them to a certain level. Buyers don't pay the high costs of a new car, but get the peace of mind that they would get from purchasing a new vehicle. Manufacturers love the idea that their names are being backed by cars that have met their highest standards. Most Certified Pre-Owned cars are ones that are low in years and miles, and they tend to be off-lease vehicles that have been traded in. Manufacturers require that certified cars be put through specific regulations and inspected thoroughly. Each major manufacturer has its own specifications for what comes with certification, including type and length of warranty. Most manufacturers have also included benefits such as roadside assistance, special financing and free oil changes.