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2009 CC 6.4 60,000 miles. I've had this truck about 6-7 months. Lately it has started to use coollant. The last few mornings I've noticed I get white smoke blowing for about the first half mile I drive. Doesn't do it at idle, but starts once I get on the road and accelerate. I got my PCM letter this week and will be scheduling that tomorrow. What should I request they check? Pressure check the EGR?