My neighbor bought a 2000 Freightliner with 500,000mi on it. In FIVE YEARS he added another 710,000! The only bad thing is it's a pre Mercedes era Cummins ISX, still not bad, though.

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!