I changed my plugs this morning, as well performing an oil change. The first 3 plugs were in excellent shape, as they should be with 20K miles on them. (I'm obsessive, sue me ) The number 4 plug (furthest to the rear of the engine) had oil around the bottom 3 or 4 threads. Upon looking into the spark plug hole, I could see a trace of oil accumulating around the bottom of the tube. I really don't think it's anything to worry about, as it wasn't really a lot of oil, therefore, I believe the leak is very slow. If anyone thinks it should be addressed sooner, please tell me so! At my next oil change interval, I'll do a valve adjustment and replace the spark plug tube seals. Here are some blurry pics from my cheap-ass camera:

the #4 plug is on the left




a blurry close-up of the culprit

 

are those platinums or iridiums?

 

Those are the OEM platinums. I replaced them with IFR7G-11KS (iridium) as per the NGK catalog.

 

I would put the OEM plugs back in, esp with 20k on them.

The oil in the plug hole is likely due to a spark plug tube seal (the one pressed into the valve cover.

 

put stock plugs in....what are your driving habits like?

 

is there any cause for concern with this slight leakage?

also, do you think using krank vents would exacerbate a leak problem since it puts stress on these seals and makes "popping noises"?

 

Yes, the leak will eventually short out the coil and cause misfires.

I won't get into details, but I don't support krank vents and none of my customers will ever get them.

 

Just out of curiosity, why do you recommend against iridium?

 

I have nothing against Iridium.

I find it amusing someone would buy a cheaper plug online or where ever, put it in their car, and think they have done some great service.

Honda has entrusted NGK to manufacture a plug, specifically for the s2k. One that has proven to be indestructible in 100k miles.

Changing the plugs to anything else is a dis-service to the car, unless you are FI and need to lower the range.

 

98079-571BH is the correct Honda plug.