Spark Plug for 4AGE BT 20v engine is IK20.
For further information, u may refer this website
http://www.globaldenso.com/en/products/aftermarket/plug/basic_knowledge/heatrange/index.html
Owners of eight and twelve cylinder engined BMW’s manufactured between 2001 and 2009 are advised to bring in their cars for BMW Malaysia’s technical service campaign...