Word of warning. Unless you're sure your cooling system is in top shape i would advise against the strong long lasting coolants from Halfords and the like.
It has caused no ends of leaks in mine, when it was running just fine previously - im guessing its dissolved or moved some gunk stopping the liquids getting out... possibly old radweld!
coolant change and fresh radweld, im all ok.
Halfords advanced coolant - caution
Moderator: RichardW