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Good advice here.^ Lots of guys running Duramax's 400,000 miles and more. As mentioned, change ALL fluids now, if you haven't already, including front and rear differentials, transfer case, transmission (TES-295 fluid only! And spin-on filter), brake fluid flush, hydro boost fluid flush, and (very important) cooling system flush. Brake pads are probably good for another 50k, but the pins should be cleaned and lubed. No guarantees, but if you haven't abused your truck, it should take you to 300,000 no problem. Consider deleting the EGR and DPF, as these can cause problems.
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2016 Montana High Country 310RE
2020 Chevrolet Silverado 3500 HD LT CC 4x4 Duramax 
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