@uncleharry … If I understand your thought correctly, if there was a way to continuously change engine oil so the engine oil was always fresh, would there be a benefit?
This seems like a calculus problem. What is the benefit curve of engine life as the oil change frequency approaches infinity…
I’d say there would be no benefit if the frequency was higher than the oil’s capability to lubricate the engine since the oil’s ability to protect is not linear. Oil does just fine until it can suspend no more harmful particles and the additive package is used up. Then engine wear accelerates.
Oil change intervals are conservatively short so this doesn’t happen. Engines are better, oil is much better. 3000 mile changes are now 5000, 7500 or even 10,000 miles. Some change earlier because of time or because short changes just can’t hurt. Some people, or fleets, use oil analysis to check on the condition of the oil at the change and the wear rates on the engine so they can extend the change.
My conclusion is; You’d run an awful lot of expensive oil through an engine for little extra benefit.
My 2 cents. I’m interested to hear other takes on this.