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0311mm Why 17 Z

This plug shows an overly rich condition, but that is better than overly lean. A lean plug will have a bluish tint to the strap and may have speckles on the porcelain.
Why Nitrous?

 This plug shows an overly rich condition, but that is better than overly lean. A lean plug will have a bluish tint to the strap and may have speckles on the porcelain.  View Related Article

 

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