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How to Replace Your Car's Spark Plugs

Model: Mercedes Sl MK 5, R129 - Years 1989-2001
Part: Spark plugs

This guide aims to assist those looking to change their car's spark plugs independently. The spark plugs are a crucial part of the ignition system. Their job is to produce a spark capable of igniting the mixture compressed by the piston in the combustion chamber. To maintain good efficiency, spark plugs should be cleaned every 6,200 mi and replaced every 12,400 mi. To change the spark plugs, first disconnect the high-voltage wires connecting them to the distributor, then clean the area around the spark plugs. Use a specific wrench to unscrew the spark plugs.

Updated on 21 February 2026 by ScegliAuto

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