Another my mechanics fan ;) Was literally just watching his latest video. Happy not to use WD40 if that's his advice. I know oiling bearings which have grease

Another my mechanics fan ;) Was literally just watching his latest video. Happy not to use WD40 if that's his advice. I know oiling bearings which have grease in them is a no-no for just the reason you describe - will loosen the grease and so ultimately damage the bearing.