Quote:
Originally Posted by No one
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.
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thank u very much for your help