20/50 dino is all I will run in my 84 Westy, especially during hot
summers and have for the past 8 years traveling all over the country. 
10/30 or 10/40 is acceptable during colder extended periods, but
that's usually during the winter months.  Single wt 30 or 40 makes the
oil light flicker like crazy at a stop after a long highway run, even
with a fresh engine.

Now for my Ex-81 Vanagon with the 2.0 Air Cooled, when living in
Redding, CA, I ran 50wt in the triple digit summers common for the
area and 40wt in the very cold winters.
-- 
Jim Thompson
84 Westfalia 2.1 "Ole Putt"
73 K Ghia Coupe "Denise"
72 411 Station Wagon "Pug"
oldvolkshome@gmail.com
http://www.oldvolkshome.com
**********************************
For older 1600 upright engines, I've always run 40wt clear back to the 60s.

On 8/24/05, bueses <bueses@earthlink.net> wrote:
> I know we have beat this to death recently, but I can't seem to access the
> archives. Help? What weight oil for a 1200 mile  rd. trip to BFE Nevada w/
> temps over 100?
> 
> TIA,
> 
> Tom