Hello Ozcub,
You pose some interesting questions.
I take the dash to mean from 10 "to" 30 viscosity, ranging from cold to hot.
Lake Speed Jr. has a site called the Oil Geek and I am sure you can find much more in-depth answers about oils there.
As a Certified Lubrication Specialist with over 20 years experience, The Motor Oil Geek channel delivers real data about motor oils from an expert perspective instead of speculation. Twice each month I will upload a new video that either analyzes a new oil, dyno tests an oil, reveals the details...
www.youtube.com