coolant colors - what is blue?

[Kneale Brownson]

The Audi product for older cars should be compatible with other
phosphate-free (green???) coolants, I'd think.  It's not like the
"permanent" type antifreeze products that have been supplied in the last
few years.

At 06:56 PM 1/5/2004 -0600, Livolsi, Stephane wrote:
>Thanks for the answers. General consensus is that it is Pentosin brand
>from the dealer, which makes sense as the car received most of it's
>service at a dealer before I got my grubby hands on it.
>
>Step 2.  It was -35C this morning, expected to be about the same
>tonight.  I want to boost the mixture a bit (seemed a bit slushy this
>morning)  Can I add some green stuff, or not?  I really, REALLY do not
>want to do a drain and fill at -35C as I don't have a garage so I'd like
>to just take a bit out and add some but I don't think I can get the blue
>stuff around here.
>Any comments on compatibility of blue stuff with green stuff?
>
>Regarding the weather, it has been in the -30s for the last couple days
>and expected to continue for a couple more.  The long term forecast
>calls for rain in about a week. Go figure!
>
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