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
I'm Brian, been owning and driving BMW's for many years, i'm 52 years old, recently i decided to go on the 'wild side' when a childhood buddy of mine offered me to buy his 1989 BNR32 GTR. (original, not a...