Noticed while doing a compression test: https://honda-tech.com/zerothread?id=445788

That my plugs were a little green, all of them right above the tip. Just wondering if its time to replace 'em thats all.

 

humm, well i do mine at the begining of every summer anyway. But i average 20-25k a year, even 30 one year on my car. Im not sure the manufactured recomended intervals but NGK's are cheap, if your in doubt, just do it, wouldn't hurt if thats what your asking.