Just got back a used oil analysis since my truck just went out of warranty. I had been wanting to run to the new Penzoil Ultra but can never find it in 5w-30. I'll probably stretch her out to 7000, recheck and call it good. This report is testament to factory engineering performing as it should. All the filters are OE etc. On this interval there was a 1500 mile trip with speeds averaging 85 and up, some towing but not much, and general mountain driving.
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