At yesterday's MTR meeting, there was a brief discussion about the crap that we sometimes find during oil changes, use of filters, etc.  This article mentions "classic" motorcycle oils that will hold (smaller than rubber oil line) pieces of "crap" in suspension rather than dumping it in the sump.  Interesting read.

https://www.bennetts.co.uk/bikesocial/news-and-views/advice/bike-maintenance/best-oil-for-my-motorcycle?fbclid=IwAR0iGaivgP2rT9YwljVb4KUo4f83OMczIwI74ffCt87NEBmrVpQB0wVv--s