The old piston engined airliners with large radial engines did not ever change the oil. The entire maintenance procedure was to drain the oil sump and clean the oil screen, then top off the oil tank.
In WWII, maintenance on vehicles was usually just topping off the oil and not changing it. Some engines lasted for years without an oil change. Still, probably not a good thing, but oil was harder to come by. If an engine eventually died, you just replaced the entire vehicle.