Quote:
Originally Posted by rohe
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Hi,
It's best to add the same one you have. That's buy from a dealer (if you still have the factory one).
At the very least the colour must match.
While having the car serviced the last but one time I had just the coolant added (free of charge, so I made no water comment
). The last time I had the car serviced (an official service every time) the mechanic checked the density and made no comments on it. So a little of undiluted is fine but for colder climates only, as it increases frost resistance. Keep in mind that in a warmer climate
higher concentration should make it more vulnerable to boiling.