8. Why are there different weights of motor oil with different viscosity levels for different car engines?

Because oil need to penetrate very small niches inside engine. But size of these niches varies between different engines. Viscosity needs to be low enough to penetrate niche (not to stop at the edge) but high enough to stay inside and lubricate instead of just going through without much effect.

the answer should be d) he was one of those young thousands who greeted the war with a certain amount of relief, welcoming the liberation from webs of tangled emotion" since it is the best option because it shows his desire to free himself.

hope this answer you! have a great day.

a. the man as a ruler