Replacing Spark Plugs on Mercedes Benz W123

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First, you must buy spark plugs that correspond to the engine or their equivalent. Consult the owner's manual.

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Next, you must use a spark plug wrench. Apply force while twisting counterclockwise, until you remove the spark plug.

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Insert the new spark plug. Be careful to not let the new spark plug fall because it can alter the opening of the electrode. It is recommended to use a piece of hose or a wrench to insert it carefully, turning it in a clockwise direction BY HAND to avoid damaging the threads if inserted wrong.