This, somewhat, represents the actual oil viscosity at room temperatures and way below freezing temperatures.
Oils used in the "test" are:
- LiquiMoly 5w20 (some say that it is Group 3 hydrocracked)
- LiquiMoly 5w50 (supposed to be PAO)
- Conventional Lukoil 10w40 (comparable to SuperTech 10w40 or similar)
Since the video is not in English, I just took screenshots and will explain what is going on.
In this first picture lab probe tubes are filled with oils listed above. Inside goes a small bearing ball. All bearing balls are from the same bearing, so they are identical in size and weight. Then the probe tubes are flipped over at exactly the same time (as they are tied together) and the ball bearing fights the oil viscosity to reach the bottom of the probe tube. Obviously, ball bearing that reaches the bottom first - indicates a lower viscosity of the liquid that it's in, and vice-versa.
At room temperature 5w20(right) is a clear winner, followed by 10w40(center), and 5w50(left) takes the last spot.
After a few hours at freezing temperatures the same oils show interesting results. 5w20 reaches the bottom first. Then 10w40 again has a slight lead over 5w50.
Interesting lesson that not all 5wXX are created equal, and some 5wXX synthetics are more viscous in freezing temps than a 10w40 conventional. Discuss.