Blackstone Lab's newsletters are always interesting (to me, at least), and
some of you might like reading them as well.  The latest one answers the oft
asked question "are magnetic drain plugs worth the money?"  (No.)

Starting in April 2012 they purchased several vintage oils off of eBay and
analyzed them.  So, if anyone is interested in how oil technology has
advanced it's fun reading.

http://www.blackstone-labs.com/newsletters.php

Stuart

(I do an oil analysis every year or two)