Cooltech 41 Red OAT Longlife Antifreeze Concentrate 5 Litre. About Cooltech 41 Red OAT Longlife Antifreeze Concentrate 5 Litre. Cooltech 41 is a high-quality antifreeze coolant concentrate. The product provides all year-round frost and corrosion protection and is formulated for use in all engines, including those constructed from aluminium alloys.
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