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The world record for the highest-mileage Ford is actually a two-way tie. There's a 2013 Ford F-350 Super Duty with a 6.7-liter turbo-diesel engine, and a 2000 F-350 with a 7.3-liter diesel under the hood, and both models have packed on an estimated 1.3 million miles (the odometer actually stops ticking up at 999,999). If we have to call it a winner, the 2013 F-350 still has its original engine, but the 2000 F-350 still has its original engine and transmission, making it the more impressive of the two. Of course, crossing a million miles is amazing, no matter how you get there https://carbuzz.com/highest-mileage-...50-super-duty/
That's impressive, especially with original engines.
Back in the 90s I knew an old-timer that drove daily 200+ miles to pick up newspapers printed 110 miles away to bring them back to our small town and distribute to the newspaper delivery folks.
He had a mid 70s square body Chevy 2wd that he used for that purpose that he had bought new. He supposedly had put a million miles on that truck over the course of a couple decades. They had a big write up in the newspaper about it. That truck had been fully rebuilt a few times, I think he went through at least 6 engines, just as many transmissions and who knows how many other parts he had replaced numerous times to keep it on the road.
I find it very impressive that you can get that amount of mileage out of these trucks without doing a top to bottom rebuild for the whole truck at least once.
I did have a 1979 LTD wagon with the 3 speed automatic, C6? I think? I got 300K out of it before the car went to the scrap yard due to rust. THAT was impressive because transmissions back then went 80K and POOF had to be rebuilt.
Older engines could last longer because they made no power and they also had less emissions equipment on them. Not too difficult to keep a transmission together when it's only seeing 250-300 HP.