Amsoil - All About Oil
 

This Amsoil publication explains all the basics of the functions of oil and filtration. It will also give you an insight into some of the differences between synthetic and dino oils.

YES, this is a blatant advertisement for Amsoil products (ya think?), but the reason I post the link to it here is that it explains things like ...

Viscosity
What the numbers mean ... 5W-30, 20W-50
What the API Classifications mean, and how they work
What additives do .... etc, etc.

If you read this, you'll definately know more about oil than the average "Joe" ... heck, you'll even be able to talk about it at parties:D

But seriously, whether you are a dino fan, or a syn fan, this is a good little knowledge base about motor oils.

https://www.amsoil.com/lit/g52.pdf

Cheers
pickme:
Cam