We changed the oil in a Jeep (Grand Cherokee) that had gone to 60k without an oil change. We did 500 mile OCI’s for a few months on it and the engine is going strong to this day.
The husband and wife both claimed the other had been getting the vehicle serviced regularly.
The oil filter in it looked worse than this one shown here, the pleats were no longer visible. It was like clay on the paper. The oil that drained out (miraculously there was still about a quart of liquid in it) looked like and had the consistency of melted chocolate.