Had my dealer charge the oil in my 2019 . Before leaving I checked the oil level and I was surprised that the oil looked liked it had never been changed. The truck was moved from the service bay to the front of the dealership. I went back in inquired. I was told " its a diesel , they all do that - can't get all the oil out when changing , so the new and old mix.
Don't think I have seen that in any of the diesel tractors on the ranch - which we service ourselves.... it takes a couple of hours before I see any change