Re: LV Focus, sparkplug failures.
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Were the plugs aftermarket and out of spec?
I had you beaut Bosch and they were running too hot. Went back to NGK copies of the MotorCraft standards.
Heat/knocking can break them down. The heat and vibration is a catalyst to particulate matter to act like a corrosive material.
You might have a claim against your mechanic or the plug manufacturer. You might have no recourse other than a new engine, cheap Focus 2nd hand or a new Corolla.
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