Prestone Prestone Ready Mix Antifreeze Coolant 4 Litre Prestone Ready Mix Antifreeze Coolant 4 Litre For Vehicles with expansion Tank. With engine cold remove Pressure Cap and fill tank with Prestone® Extended Life 50/50 Prediluted Antifreeze/Coolant to cold line. Replace cap securely. Prestone®... £34.99 £23.99 Add to Cart Add to Wish list