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I have a 1997 Chevy C3500 C-C Dually with 454 and auto trans. It has 162,000 miles and doesn't use any oil. I use Mobil-1 10W30 weight, change it every 5,000 miles along with the oil and fuel filters and have no oil consumption. I did have to change the valve cover gaskets around 150,000 to stop the seepage of the slick oil.
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