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    Possible COUNTERFEIT DENSO "U Groove" sparkplug KJ16CR-L11? Bought from authorized dealer, Advance Auto Parts

    I just bought a set of four DENSO spark plugs from an authorized Denso dealer (Advance Auto Parts brick and mortar store) KJ16CR-L11 supposedly has a "u groove" ground on it. I checked this plugs and noticed that the ground instead has a standard ground with a tapered end point like you'll see...
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