>
> I can buy a pail of diesel 15w40 CG-4 oil for around $29 canadian.
>
This is my favorite weight oil for a warm summer, I buy it in the 5-gal
pail from a local distributor. The stuff I get (I won't mention the
brand, people seem religious about that stuff) is also SF rated. I
started using it about 10 years ago when Mercury Marine (I used to work
on boat engines for a living) issued a service bulletin recommending
25w40 in their inboard engines. Of course, they sold it for $3.00 US per
quart! This was the closest match I could find, and have been using it
in my cars in the summer, and 10w30 in the winter.

No oil related failures on my engines (as of this writing). Although the
Notchback suffered an octane-related (or is that timimg-related, or
compression ratio related) failure.
--
TomC
tcarrington@relitech.com
http://www.relitech.com/tomc/tomvw.htm
85 Vanagon Crew Cab
82 Vanagon Westy diesel=>gas conversion
65 Notchback