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    5.3L Vortec High Mileage Mountain Use Only

    What are some good oil options for a 5.3L Vortec in a 2001 Yukon that has 160k. No valvetrain noise. It will be driven in Colorado Rockies only. Literally from airport downshifting and reving high all way up and down the mountains and back to the airport. Last year we drove it on 10-20 degree...
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