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Duramax Third Generation: 2006-2007.5 (LBZ & LLY)2007 Classic GMC Seirra 3500, 375,000 miles, To start bought this new in 2007 never touched the motor till 305,000. Replaced the head gaskets, removed EGR and new injectors and CP3 pump. Shortly after I replaced a leaky seal on the oil cooler. Shortly after that I lost coolant at a quick rate...
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