
Installed on my 2001 Mercedes s430. Worked great. If anyone should have these spark plugs installed and is experiencing rough running or misfiring, which is due to poor spark plug gap (they come before gap but can be accidentally replaced upon delivery or dropped by the installer) or faulty spark plug leads. I have 144,000 km on the S430. I connected these spark plugs to a set of Bosch spark plug leads. Wires will become brittle and less effective over time.

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