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Old 05-11-2011, 10:04 PM   #1
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What Do Green Marks on Plugs Mean?

I recently purchased a 2003 wrangler sport and was changing the oil for the first time and saw what looks like green check marks on some of the plugs, and a blue mark on the oil drain plug. Any insight as to what these mean?

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Old 05-11-2011, 10:11 PM   #2
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Factory markings to verify they were inspected and torqued properly.
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