I don't remember the colors, but there are two types of coolant when mixed together can result in a sludge that will kill your motor.
I thought it was the green vs. orange that would turn into sludge. Here's what I could find on
but it doesn't mention the sludge.
Quote:
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Originally Posted by http://www.aces.edu/dept/extcomm/newspaper/coolant.html
Don't mix the green, silicate-type antifreeze with orange antifreeze, Donald adds. The organic acids in orange types will cause separation of silicates in the green type, which greatly reduces corrosion protection.
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However, there was a service bulletin about VW's that's along the lines of what I remember hearing:
http://www.detnews.com/2002/autoscon.../d01-32628.htm
Bottom line is, I just stick to the normal green stuff and distilled water.