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Hello, had a CEL yesterday, and brought my Mercedes Benz to the dealership for a scan.. turns out that it was bad glow plugs at only 28,000 miles. I acquired this vehicle at 26,000 and the dealership said it was the first time they ever saw a vehicle with such few miles and this problem. Glow plug # 4 went bad, but I figured that it would not be long before the others failed as well, so, for an extra hour of labor, they replaced all six .. one would have been a minimum of two hours labor, so 3 hours for all six seemed reasonable. My question is whether it's possible if the original owners didn't follow the two step starting procedure, could this have prematurely worn out the glow plugs. What's the average time or mileage for these item? Also, with a modern diesel engine like the Mercedes Benz 3 litre V6, having a failed glow plugs would affect engine performance and fuel economy?