Oil... how does it work? [split]

[Vovchandr]

@Cossey

I don’t get what’s so hard to understand this:
5w20
At 32F, the oil acts like a 5 weight due to additives and what not. At 212F, due to additives and what not, the oil acts like a 20 weight.

So when it acts like “5” @32 does it act thinner or thicker then when it acts like “20” @ 210?