If you have any questions about either section, I suggest that you contact these folks directly. The Antique Tractor Forum did not author this nor can it, it's manager, spons0r or members be reponsible for it's contents. The authors have provided this information as friendly advise and observations and do not proclaim to be experts in the area, have full knowledge of your particular circumstances, nor intend to keep the information current. They inform you to solicit expert opinion for confirmation before following thier advise or using this information. This may get a little long, but I want to share with you some of the things I learned in my locomotive days.
Oil performs several functions.
What I learned is that there are numerous tradeoffs made in all these areas and it is useful to look at some of them. Some of these areas are in conflict. You can count on regular, automotive oils to be a good compromise for use in modern automotive engines. If your use is otherwise, it helps to understand what they did. This is to transfer contaminates to the filter so they can be removed.