Note that Sierra is propylene, not ethylene glycol based. Do not mix.
Also, temperature transfer characteristics are not as good.

Whatever coolant you use, stick to one brand/type, use distilled water if
you live in a hard water area and change it as recommended by that
manufacturer. For the Waterboxer, I have not seen much difference in
results even with the green stuff.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Markus Mumper
Sent: Friday, October 05, 2007 1:22 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Coolant recommendations

>List, other than the blue VW stuff, what coolant would you recommend
my 1991 Syncro Westy?<

When I called GoWesty with this question a few years ago they recommended
Sierra (green, phosphate free and readily available).

Markus
'87 Westy