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Message: <blockquote data-quote="ORVietVet" data-source="post: 22630" data-attributes="member: 9438">I will also say that the oil used, since the beginning is Mobil 1 full synthetic. I have been using Mobil 1 full synthetic in my 170k miles Tahoe but on next oil change I am doing Valvoline 5w-30 full synthetic Restore and Protect. Anyway, I change my own oil every 4k or 4 months, whichever first. My own oil looks the same when drained on the Tahoe. Please post pics of your oil at end of 3k or whatever mileage you change yours at. I would be curious how it looks and under what conditions you drive it and what oil you use and the oil change interval. I do love comparisons for all of us at the forum.The whole idea here is to share and help and make our trucks better for it. Even if it is a Ford we are talking about. That is why this is posted in the Garage Forum because I work on all kinds of vehicles.</blockquote>