Babygotback is right unless its a typo (67k intead of 6700).

 

In your warranty service book under severe maintenance (which specifies Canadian climate as severe) It says to replace (not inspect) your plugs at 24,000 Km. so unless you want to screw yourself out of your engine warranty you best to replace them and bite the bullet. I just changed my plugs and they looked very different to many other plugs I've changed. (pic Below)



I had the ngk's in and got the denso's. Mitsu is mega strict with warranty stuff up here in Canada.

 

thats funny i have irridiums densos in my car and i am in canada

 

At 33k? Nah, dont even think about it.