I have a 99 with 150xxx and a 02 with 521,xxx. Honestly its how they've been maintained. I've seen a couple with under 150, and they look as if they have 300 on them. And in the case of my 02 it was a one owner and very clean inside and out with good maintenance history, actually the whole life story of the truck. These are great trucks
The company I used to work for ran a fleet of 7.3's and ran them hard. The highest mileage one had 331k when we sold it 5 years ago and it's still running around. The lowest mileage we saw was 110k before we lost compression. These trucks rarely left the yard without 10-20k lbs. behind them.
I have an 02 with 141k on it and have replaced the hpop seals. Other than that, I change the oil. I have a 120hp tune on it and I trust it to get me anywhere I want to go. As with anything, look for the lowest mileage clean truck you can find.
mine all have over 200k, the Ex had 243k on it when we got it a little over a year ago, didn't bother me at all to buy it with that number on the odo... red truck hit 200k a few months ago, thoes 2 run great, the yellow truck hasn't been used much lately due to a few reasons (needed to paint the frame and install a utility bed, etc), but for the mileage on it, no complaints.
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