Normally for Denso Iridium spark plug, it last 100k miles... approximate 160k km.
For Denso Iridium Performance Spark Plug, it last for 40k miles only.

So, let said we excluded the spark plug used during traffic light, traffic jam, or waiting for someone special... change the spark plug every 100k km is possible. Unless your got extra pocket money to change it before 100k lor...
