I had a friend a number of years ago who had a Ford Bronco II. He did zero maintenance on the thing. It always started and always took him to where he was going.
One day, I asked him how often he changes his oil. He told me the oil is the original oil that came in the thing, he doesn't believe in spending any money on a vehicle at all, then, eventually, when that vehicle comes down with some expensive problem, he just sells it and buys another new vehicle.
He had about 64,000 miles on the ORIGINAL OIL (which would NOT have been synthetic), and on the oil filter! The engine ran fine and didn't burn any oil as far as I could tell. I had driven his vehicle a number of times, including when we needed to pick up his vehicle from about 1,0000 miles away.
I did get on his case, however, when the right-front tire steel cords where hitting the front fender while he was cruising at 80 MPH! We eventually stopped at an old gas station and he let me talk him into replacing that tire with a used one from a junk-tire pile out back. At least the cords weren't hanging out of the tire he bought (for about $34)! All I could visualize was a blowout and the thing rolling a number of times, not to mention being tangled up in every other vehicle on the road around us!