Coolant top up

I've got a 2004 Megane 2 dCi80 and I've noticed the coolant level is below minimum - it's service is due towards the end of the year but I know I should top the coolant up. What do you reckon I should use? Distilled water or coolant, and which coolant?
Buy it from a Renault dealer and top the reservoir up.
Answered by Honest John on

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