The GM Certified Pre-Owned Program is a great way to protect your investment. The benefits of the program consist of a 172 point vehicle inspection which is much more extensive than the required state inspection. A 12 month/12000 mile Bumper to Bumper Limited Warranty. If a vehicle is purchased with existing bumper to bumper limited warranty the CPO warranty starts at the end of the original bumper to bumper warranty. The CPO bumper to bumper limited warranty starts at the date of purchase if the existing bumper to bumper is expired. You also receive a CPO powertrain warranty of 6 years/100000 miles from the original in service date. A CPO vehicle comes with a 3 day/150 mile satisfaction guaranty exchange program. Lastly, certified pre-owned vehicles come with a 2 year/24000 mile service program, for a maximum of two visits. Visits consist of an oil change, tire rotation and a 27 point inspection. All Chevy, Buick, and GMC vehicles must be 5 years old or newer and have less than 75000 miles to be eligible.