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Originally Posted by bruker
I used Motorcraft semi-synthetic 5w20 in my `01 Windstar and it had 204,000 miles on it when I sold it. I'm now using Penzoil Platinum 5w20 in my `04 Taurus with the Duratec and I'm changing the oil & filter at 10,000 intervals. I now have ~65,000 miles on it.
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I read a test on a Boss Mustang running Mobil1 doing 10K oil changes and the oil analysis was not bad either.