Plus a whole lot more, including some speculation by the author. The middle's his opinions, but the facts about oil nomenclature are interesting; at least I found them to be:http://www.paladinmicro.com/pmicro.php#
Apologies, the link does not copy and takes you to the main page. To see the article, follow the links on the left margin for:
5w-20 Nyet for me
To me, this article sheds some light on the 30 vs 20 debate, even though it's an old (2011) article.