type of spark plugs

[smugglin1986]

i have been reading that for an 02 wrx you can use either the pfr6g or the bkr6eix. which one is better and why?

[SeattleJeremy]

Spark Plug FAQ: Read if you want spark plug information! - NASIOC

pfr6g - Platinum
bkr6eix - Iridium

Iridium is suppose to last longer.

[brfatal]

I thought Platinum was supposed to last longer? Either way, I ended up with Coppers after my car rejected the Iridiums I put in them.

[SeattleJeremy]

ACDelco | Auto Parts | Spark Plug | Iridium Spark Plugs Description

[Donkey]

Iridium has better conductive properties than platinum but not as good as copper. Copper plugs need to be changed 5x more frequently than platinum or iridium.

[SeattleJeremy]

Iridium has better conductive properties than platinum but not as good as copper. Copper plugs need to be changed 5x more frequently than platinum or iridium.

Votes for best answer

[brfatal]

Yep. But I think they were less than a dollar each.

[Donkey]

Yeah but I get NGK Iridiums for around $5 each. So for me its worth it not to have to change my plugs every month. Running high boost will kill copper plugs even faster than stock boost levels due to cylinder pressures and heat. Copper is just way to soft.