@Jeffrey_Johnson. I just follow the owner’s manual on oil changes. I grew up in the day when 2000 mile oil changes were the norm.
The type of driving and the weather conditions make a difference. If a car is used for long distance highway travel in warm weather conditions, a person can go probably three times as far as stop and start short distance cold weather driving. Modern cars with computer controlled fuel injection and electronic ignition systems are much easier on oil than the points and condenser ignition and carburetors that dump.fuel in the engine.
Today’s oils are certainly better than motor oils of the 1950s and 1960s. I remember when oil passages in the engine block would.become plugged with sludge even when regular oil changes by the book were performed. I did oil changes even more often than required in a 1965 Rambler that I once owned and still had an oil passage in the block get plugged up.with sludge. I bought the car in 1965 with 7,000.miles on the odometer. The problem occurred seven years later at 90,000 miles. A shop that did a lot of work on trucks pulled the cylinder head, chucked a piece of speedometer cable in an electric drill and reamed out the oil passage. My bill for this work was $45. The shop owner said this was a common problem with that engine. He had seen the same problem in International pickups that used the same engine. He said that unless I had changed the oil and filter every 1000 miles, there was little I could do to prevent the problem. That’s why today I am hesitant to go beyond the manufacturer’s recommendations on oil changes. I don’t think I could find anyplace today that would remove and replace the cylinder head and clean out an oil passage for $45.