drkarrow -- Actually, you are correct, sir. When they want to stress test motor oil (ferinstance), it is put between two close-fitting concentric cylinders that are spun against each other. It can rip the molecules apart. In this case the boundary layer is your friend. But still, what Sven7 said.
Sven7 --
Imagine the Beetle's backlight about where the middle of the Tatra engine is:
