Spark Plug, NGK Laser Platinum - E46 M3, MZ3, Z4M

This is the OEM NGK spark plug used in the S54 engine in the E46 M3, MZ3 S54, and Z4M Roadster/Coupe.

Just like ignition coils, spark plugs are key to the performance and efficiency of your BMW engine. A bad plug(s) will harm performance and fuel mileage and affect drivability and engine smoothness. Unburnt fuel in the exhaust will shorten the lifespan of oxygen sensors and catalytic converters. Spark plugs wear out over a long time, making losses in performance less obvious. While BMW may recommend "lifetime" 100,000 mile replacement intervals, we generally recommend 50-60,000 mile replacements.

Copper vs Platinum. Platinum plugs were introduced in the late 1990s to fit with BMW's extended service plans. They last longer than copper tipped plugs but will give up some performance, especially on highly tuned engines or for competition use. Copper plugs will need to be changed more often but will deliver better performance. If extracting every available horsepower matters more than longevity, choose a copper plug. For a daily driver with less emphasis on performance, the platinum plugs are not a bad choice.

NGK was the original supplier to BMW for this spark plug as well as most of the other ignition components and other parts and systems on your car. Having the correct plugs in your car ensures optimal performance and efficiency from your engine. The OEM plugs meet the design requirements set by BMW for a wide range of operating conditions and fuel mixtures. It's the best all-around plug you can buy.