Why buy from Graff Chevrolet of Okemos? FREE 2 year/30k mile maintenance with any used vehicle purchase!! We have been making friends since 1914. All vehicles are safety inspected by certified mechanics. You can drive with confidence that all pre-owned vehicles purchased at Graff Chevrolet Okemos will recieve the FREE "Pre-owned Peace of Mind Program" that includes 2 years/30k miles of free maintenance. See dealer for details.