How Can You Tell If A Spark Plug Is Worn Out?
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VIDEO: How Can You Tell If A Spark Plug Is Worn Out?

The difference in wear between spark plugs can be almost imperceivable. This video is sponsored by Autolite.

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Gauging the condition of a spark plug on appearance or width of the gap can be problematic. Often a high-mileage spark plug will look great, but the shape of the center electrode might tell a different story.

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This video is sponsored by Autolite.

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