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oil in coolant
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  1. Duramax Fourth Generation: 2007.5-2010 (LMM)
    I bought an ‘09 LTZ w 217,000 to use as a work truck. Have put nearly 25,000 on in since March. Last month I blew that bs plastic interconnect on the Outflow from the Heater Core, and drained my system. Replaced with aftermarket Chrome piece, filled w/ coolant then it started...
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