Spark Plug, Bosch - E30 M3, E28 M5, E24 M6
OEM plug for the best all-around performance and efficiency
This is the OEM Bosch spark plug used in the S14 in the E30 M3 and M88/S38 engine in the E28 M5 and E24 M6. 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. 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.
E30 (84-91) > M3
E28 (82-88) > M5 (87-88)
E24 (77-89) > M6