I always run colder pulgs in any engine that is subject to any sort of hard driving, including my own, as the engine will usually get hot enough for the plug to get to it's self cleaning temp, whyle also reducing the chance of expensive engine damage due to the plug begining to glow red and pre ignite the air/fuel.

Iridium/platinum plugs are good if you dont want to change them every 10,000k as Balistic said, although i didnt notice much of a difference in performance or fuel economy between standard NGK plugs and Iridium ones that i had fitted, but i change my plugs every 10K anyway.

You do get what you pay for though and if you skimp on any engine part, then expect problems.

Regards,


Tom