From wooden wheels to kerosene headlamps, we tracked down a 100-year-old GMC truck to see where Professional Grade started. Read story at: http://www.gmc.com/gmc-life/path-to-precision/certified-service.html

Learn more about GMC Certified Service at: http://www.gmc.com/certified-service.html

Follow the all-new GMC Acadia All Terrain on the Path to Precision Journey: http://www.gmc.com/gmc-life/path-to-precision.html

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