Have 358,600 on my 4.8 liter '06 Express extended 2500. Uses zero oil between changes at 7,000. I ask how the oil "looks" about every 3rd change and the always say it still looks virtually new. The motor seems a little weak sometimes but it gets really worked every once in a while. Now with high rpm downshifts, as I avoid those, but with all the Jellico Mtn climbs and such. I just bought it 8/6/12 with 235,000 on it so its been rolling over the past 12 months pretty well. Battery, 2 O2 sensors, brakes, front rotors. That's about it. And a lot of fuel. I had the average up to 17.4 mpg before a/c season started. Now I'm down to about 16.5 mpg. But I can't complain too much.