h2kFrosty

iTrader: (3)

See subject... I got mine about 8,000 miles ago and was just wondering... I know they need to be replaced more often than platinum, but the question is, how often??? I have NGK 1 step colder plugs.

Thanks,

Bryan

Quicksilver

iTrader: (1)

Replace coppers every year (I would)...

JAY25

iTrader: (38)

Every 20K they are only $1.29 a piece in Louisana.

hlh0501

iTrader: (1)

I have heard anywhere from 10k to 20k changes on copper plugs.

I figure the way I drive/boost/spray I should keep fresh ones in. I typically change anywhere from 5-10k. They never show signs of needing it, but for so cheap it's peace of mind.

Kinda like chevron injector cleaner every 10-15k. Probably does nothing, but it makes me feel better with the high injector pressure I see.