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    Cummins 5.9, Amsoil DEO 5W40

    Attached are the results of 3 of the last 4 oil tests done on my truck. Given the recent high copper levels, and lack of other metals, I'm guessing it's time for a new oil cooler? This is in a 2003 Dodge Ram 2500 QC 4X4. It is basically a highway truck. It seldomly tows light loads and/or...
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