What's the oldest/most miled vehicle you have owned?
I have had several that I have taken to well over 200,000 miles. I think the longest was a 1974 Pontiac Catalina with a 400 in it that I took to roughly 325,000 miles. A close second was a 1966 Chevy C10 pickup with a 283 that I really was fond of. The Catalina died of extreme body cancer but the motor and trans were still good. Parted the Catalina out and sold the motor and trans. My commercial stuff, I have had several that have gone well over a million miles.
I have a commercial truck now that is at 965,584 miles / 20928 engine hours and, except for a starter, tires, shocks, brakes, and alternator, is all original. And it works 5 days a week doing about 2600 miles a week. It will go over 1 million miles sometime late summer. Even still has original clutch. And it uses less oil than many of the vehicles on this forum. About 1 qt per 11,000 miles and gets oil changed at around 22,500 miles. Not bad for a 13L motor that is a factory reman and has almost a million miles on the reman. I ordered this 2013 truck without a motor and trans to avoid the new diesel emissions stuff and put in a factory remanned pre-emission engine and trans in it. All within the law to do.
The only vehicle I gave up early was a 2013 Silverado 1500 5.3. Nothing mechanically wrong, I just grew to despise it. I was inventing new swear words. That is when I got my present 2015 Silverado 2500 to replace it. We also have a 2006 Cadillac CTS that is at around 120,000, and we have no intention of letting it go. Great car, clean, rust free, and only thing it has had done is tires, brakes, and a left rear axle hub a few weeks ago.
Maintenance and proper operation is key to longevity. I am a stickler for good maintenance practices.