Just looking at the video now. A very similar machine (maybe even the same brand) was demonstrated to me in person, but it was used to sell Wynns Friction Proofing, by the Wynns rep. So should I buy Wynns or Bi-Tron? Same test result.

Selling engine oil is like selling kitchen knifes. It can be a lifelong career for some, and there are many tricks you don't see right away.

I don't know how they do it, but knowing some basics may help us start to see.

What is a common lubricant used on industrial lathes and milling machines to cut metal? It is often oil mixed with water. Why are we so upset to see water in the oil? Ever seen water damage in a motor? If anything, it cleans it. Failure is more likely from overheating do to water loss in the cooling, not water in the oil. Water in the oil will provide better cooling than straight oil. (Correct me if you like not 100% sure).

Soft organic dirt is going to do very little to moving steel parts. Dirt is nothing compared to metal particals. I have driven dirt roads, sideways, with no air filters. Oil was black. Motor loved it, no damage.