I know they will "last forever" if you take care of them, but that one's got some miles on it. I've had a 2002 F350 with the same motor for about 12 years and I love it. It's got 225,000 miles on it and still going strong, with very few mechanical issues over the years. My ideal vehicle would be that motor & trans in my van. 18 MPG is much better than 10.......
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