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Every time you start your car it takes most oils 10 minutes to work effectively, because the oil cannot protect properly until it reaches a critical temperature Castrol Magnatec 10W40 A3 B4 Oil is different as it gets to work straight away by virtue of a unique synthetic ester that clings to the engine like a magnet. It provides up to 4 times more protection than a conventional oil during the critical start and warm up period.
