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
Can altezza use this newly launched RON95 petrol? if follow to the user manual, altezza need to used high octane petrol RON98 which is not available at our petrol pump yet. And so far using RON97 Im facing a lil bit...