Greetings all ..
Stumbled onto some very good short tech articles on everything from
nitrogen in tires, to engine oil, to coolant types, and so on.
It's for mostly water-cooled Porsches ..
but much applies to our water-cooled Vanagons .
Short and decently written. Worth a look.

http://www.pedrosgarage.com/Site/Technical_Articles.html

Keep the dirty side down, and the shiny side up !
Scott