Dinan Iridium Spark Plug Heat Range 12 B48 TU/B58 TU1 - D640-0003
Dinan Iridium Spark Plug, part D640-0003. Heat Range 12 performance plug for BMW B48 TU and B58 TU1 applications. The colder plug and iridium electrode are intended for higher-output or tuned applications where additional thermal headroom is desired. Verify engine generation and calibration before ordering.

