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

[jdaniels]

@Vovchandr

The ratings are done at two fixed temperatures when it’s a multigrade.

If it only has 1 number, it means it was only tested at 210 and never tested at 32.

The number itself is derived from the high temperature test, that’s what you’re missing. The numbers are all relative to the high temperature rating of a standard fixed weight oil.