Dex-cool sludge is orange just like the fluid. The medium grey crap is
most likely the precipitates from hard water. Regardless of the antifreeze
used, if you live in a area with hard water, you need to use distilled
water for your cooling system. How do you know if you have hard water? If
you have well water, most water in the South and West, if you get lime or
rust stains in your sinks and tubs, etc.

The worst sludge I have also seen is from the VW blue stuff. It makes a
blue gooey paste with crunchies.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Pascal Giasson
Sent: Saturday, November 24, 2007 5:45 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Coolant sludge? (link to pics)

FWIW, my "death cool" sludge was medium gray.  No more dexcool will ever
go
in my Westy!

Pascal
'84 Westy