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Core plugs

The core plugs, or freeze plugs, in your car are metal inserts pressed into various points in the engine block. The purpose of a frost plug is to protect the engine block if the water in the cooling system freezes due to extremely cold temperatures. When frozen, the coolant expands, putting the cooling system under increased pressure.

Without the frost plug, this can cause damage and leaks. When coolant mixes with oil, it creates a thick sludge resembling mayonnaise. This sludge prevents the oil from lubricating the engine properly, which can lead to significant damage.

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