engine cleaner

Did an oil change last night and cut open the filter after work today. I noticed these small pieces of carbon scattered around inside the filter housing and filter. Oil that was drained was Amsoil SS 5w20 and oil that went in was the same. Is this evidence of cleaning prior deposits?

Hello all, My dad just gave me his old Generac 10kW EXL. The generator has served our family for a long time now. As I was talking to him, he casually mentioned he has NEVER changed the oil or filter. Mind you, this generator has been in use for over 20 years. It runs great with no issues, but...

A story about a neglected engine and how it, thus far, has survived. Mostly by dead reckoning and good fortune, less so with measurable science. Am sure some will crow, but hopefully some constructive ideas will be shared to help others in similar situations. In Feb 2021, an acquaintance was...