That is a ridiculous and practically worthless test!
Gnarls.
I would agree with you, but add at that the test as setup in the store is also practically worthless and how they choose to advertise their product. I suspect the speed of the differential gears is closer to the drill than the speed from being turned by hand, but obviously somewhere in the middle. If that's their best marketing for it and they can't really tell you what it does to improve an engineered chemical formulation then I am highly skeptical.
It reminds me of the way Monster Cable advertised the superior speaker wires. They had extremely long lengths of the "other" cable under the setup to reduce the output volume through resistance by a dB or two knowing that in tests nearly everyone will select the louder sound as being better in an A/B comparison.
If the OP wants to run something thicker then I'd go with an actual product that has an original formulation that has a higher viscosity rather than dumping in something else with the idea that it will somehow improve something. Just my two cents, it may not be worth much.
