VW Coolant

[gatesj at mailblocks.com (John Gates)]

I have heard that G11 corrodes VR6 head surfaces but I have kept the 
blue in my VR6 changed and never had any problems.  I have also heard, 
possibly from AWE tuning if I recall, that the only VR6 heads showing 
that problem were ones that had their blue turn acidic, indicated 
clearly by color, it turns greenish/yellowish/brownish.  So the coolant 
in those cars had clearly turned color a long time prior.  That was 
what was great about the blue, it had a litmus dye in it so you knew it 
was bad.  If allowed to turn acidic, yes, it will eat heads.  If you 
keep it changed, then it's the best one out there IMHO.

And yes, Dexcool sucks especically in our vehicles.  GM started finding 
that it really gunked systems up that were not keep 100% full, i.e. 
there was some air in them.  Remember US cars are different, the main 
circuit is not supposed to have any air in it and the expansion tank is 
just a catch tank, no circulation through.  Our systems have air in 
them by design, so it's a very bad idea to use Dexcool.

John Gates
--
'85 Scirocco
'97 Jetta GLX

-----Original Message-----
From: ken weidmann <glxtasy@hotmail.com>
To: scirocco-l@scirocco.org
Sent: Tue, 07 Jun 2005 10:31:04 -0700
Subject: VW Coolant

The G-12 is fine but the G-11 coolant has problems. Many of the early 
VR6's had problems where the coolant actually ate away the aluminum 
cylinder head.  Most of the guys that I know (myself included) switched 
over to the G-12 to avoid having problems.

Just a not though. Apparently the G-11 and G-12 don't play well 
together so you need to flush the system very well to avoid comingling 
of the coolants.

Ken
1985 1/2 wolfsburg Show-rocco
1995 Jetta Glxtasy
1957 Porsche 356a


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