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Changed these out from my 2012 GS with 43k miles. The engine runs much better now but... Are the old plugs burnt? Is there something going on within the engine I should be worried about?
Most of them look perfect, especially for that mileage, with a light tan colouring on the ceramic. A couple look darker though, but I can’t tell if it’s shadowing? Where did all the oil on the threads of the one on the right come from? If that came from inside your combustion chamber, that’s not good.
Spark plugs burnt?
