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Well I've been using Mobil 1 10W40 in my 93 Pathfinder for the 9 years I've owned it. I add maybe 1 quart between 6000 mile oci's and it's got 257,000 miles and will probably go another 200,000. I'm in the final stage of a second AutoRX treatment then back to Mobil 1. Haven't done a used oil...