I used 81343 to replace 12 plugs in 2005 Chrysler Crossfire aluminum heads. For connoisseurs, these plugs are a well-known access slut. With 123,000 miles and a questionable service history, I was very concerned with the effort required to remove the old plugs and the squeaking when the plugs complained about being removed. A bad spark plug is a particular nightmare for this Mercedes engine. I used 81343 and all 12 plugs could be hand tightened to the thrust washer.
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