[C320-list] Coolant Colour & Demineralised Water

[Annie Bennett]

When my exhaust mixer elbow was cleaned out a couple of days ago, the mechanic also changed the coolant. 

My two questions are:-

1. Does it matter that the coolant he drained out was red and the coolant he's replaced it with it green.  The label on the bottle was "Zerex G-05 Formula Anti Freeze Anti-boil coolant concentration requires dilution" 

2. I noticed after he'd topped up the coolant with tap water from the galley sink, that the bottle said you should use demineralised water.

When I asked him, he said there's no difference between the colours (although my googling seems to indicate that red lasts longer?) and he said using tap or distilled water makes no difference (although my googling suggests that tap water causes corrosion).

I feel a bit awkward as an amateur questioning a professional but should I get the coolant changed again next time and buy a bottle of distilled water to produce at the service to make sure it's used?

Annie
#1073