Back in the 80s I remember buying a coolant for my MGB which changed colour as it became contaminated by the rust from the iron engine.
Not come across anything like that though for a very long time. I'd drop into your specialist and get them to have a look. A check should only take a few minutes.
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Previously held: 264GLE;S60 SE 2.0T;XC70 SE LUX D5 (163);V70 SE (170);V70 SE D5 (163)
Currently held: XC90 SE LUX (MY12 200), XC70 SE D5 (MY06 185); V70 SE D5 (MY07 185)
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