[Vwdiesel] Coolant

[Val Christian]

Gang,

I'm wondering what the current thinking is relative to coolant selection 
for the IDI diesels.  TDIs, or at least mine, call for G12 coolant.

Recently I changed a thermostat on a 2000 Dodge minivan, where there
was the "red stuff" coolant.  The thermostat failed mechanically due
to metal fatigue, thus falling apart.  No sign of corrosion, even when
I viewed the failure under a microscope.  The most impressive aspect of
this job was just how clean the engine passages were.  The vehicle has
118kmiles, and I think the interior passages and radiator were the 
cleanest I've ever seen.

Today, as the temps continue to drop, I'm faced with putting some 
glycol into the 91NA that my daughter and I did a cylinder head on 
this past summer.  I'll use the normal run-of-the-mill glycol, for now,
but I realize that long term I need to learn more about the options.

Anyone have some pointers?

Val