Spark Plug, Bosch Super Plus - E36 325i/M3, E34 525i, E39 540i, E32 740i, E38 740i

• Copper core and tip electrode for better performance
• OEM for many models, performance alternative for others

This is the OEM Bosch spark plug used in the M50, S50US, M60, and M62 engines in the E36 325i, 1995 E36 M3, E34 525i, E34 530i/540i, 1997-1998 E39 540i, E32 740i, and 1995-1998 E38 740i. There were two heat range plugs available and this is the colder version (F8LDCR is the hotter). A hotter plug is better for fuel efficiency. However, a colder plug is generally used on tuned engines or for track use to lower combustion chamber temps and minimize knocking. The plugs are interchangeable but the same plugs should be used on all cylinders (don't mix plug types).

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 "High Power" platinum plugs are not a bad choice.

Bosch 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.