I would expect my engine to be clean at 200,000 or more miles using any name brand dino with 4,000 mile OCI's.
I have used Mobil 1 since it came out back in the 1970's, changing my oil once a year. before I retired back in 2001, this was 19,000 to 20,000 miles. Of course, back in those days, Mobil 1 was always a true synthetic. Never had an engine problem in all those
years.
Now, I'm down to about 9,000 miles per year and still going with a once per year OCI, using either Mobil 1 0W40 or Mobil 1 High Mileage 5w30.
4,000 miles on any so-called synthetic is ridiculous.