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Coolant should be changed every 20,000 km's or every 1-2 years. Despite what manufacturers say. A low glycol concentration will destroy the internals of the cooling system in the engine. Also any decent quality coolant is ok as long as its mixed to the correct concentration for that particular engine...Your family mechanic isnt a sales person for nissan spare parts is he? lol

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Well if its guaranteed for say 5 years, why change it out so early for besides having an empty wallet? Its the additives in the coolant (eg anticorrosion, antifoam, alkaline buffers etc) that deplete over the time. Some of the glycol breaks down into acid (and thus depletes the alkaline buffers) but its not the glycol that provides the 'protection' as such. But this would have been factored into the interval that the coolant is specified for.

Edited by Busky2k
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