OK, the LiquiMoly video is up! The conclusions probably won't be a surprise to anyone.
Also a side note: lately I've been hearing some noise from the front end. Sounds like a bad wheel bearing. I can't really tell from the driver's seat which side is making the noise. But I think I can put a mic in there and drive around a bit, to find out. So I bought a wheel bearing / hub unit. And I'll install it as soon as I know which bearing is bad.