Question

Light oils do not imposed much drag on high speed parts is it correct?

Answer 1

Levitation magnets on the underside of the guideway are positioned to attract the opposite poles of magnets on the wraparound section of the maglev. ... The magnet in the middle moves forward. A maglev's guideway has a long line of electromagnets. These pull the train from the front and push it from behind.

Answer 2

Light oils (low viscosity) can be used, however, when lower pressures and higher speeds are ... should be preferred as they do not impose as much drag on high speed parts as heavy oils do.