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Lorne Sierra Truck

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  1. Lorne Sierra Truck
    Been a GM guy forever, I have a 2009 Sierra 5.3L. Been faithful to use quality oil and change every 5000 Km. When engine cold, sounds like a low end knocking noise. When engine up to temperature, noise is gone, engines sounds and performs great. Could this be a bearing? Just turned 200,000 Km. PLEASE REPLY
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