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  1. Coolant Disappearing Slowly (and showing up on oil analysis)

    06-07 LBZ & LLY Duramax Powertrain
    I've had to to add a 1/4 of a gallon of coolant to my truck twice in the past 2 years (both times in February). The last time the Check Coolant warning came I let the truck sit in 30 deg weather to cool down and I still couldn't remove the cap due to all the pressure behind it. I had to use...
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