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An engine oil filler cap is a device that is used to cover the engine oil filler. It provides protection to the engine oil filler by preventing external elements like dirt, debris, and liquid from entering the engine oil filler that may cause contamination of the engine oil. An engine oil filler cap can be removed when adding or changing the engine oil, thus keeping the car operating properly. A broken engine oil filler cap will expose the oil filler and allow external elements to contaminate the fuel, resulting to poor engine performance. Auto Parts Network carries reliable parts that will maintain your car in top running condition.