Well it was about that time to change the spark plugs on my CRX D16a6.
Anyways, when I took out the plugs, I noticed some oil has gotten the plug on on cylinder 4 and a bit on cyl 3. Btw, seems only 1 electrode is oily.
The valve cover gaskets are 4 years old. I did check for tightness of the valve cover and it seemed a bit loose.

Could this be a symptom of worn bores/piston rings or valve guides ?
My CRX has 265,000 km (164,663 miles)

Also, I bought the NGK BCPR7E-11 plugs which run 1 step cooler.

Some pics:









OLD VS NEW

 

this may help

http://www.tegger.com/hondafaq/oilyplugs/index.html

 

This is a great video on this matter:

http://www.youtube.com/watch?v=wYU8qtPzQOY

 

I had the same problem, turned out to be the O-rings under the rocker assembly. Major PITA if you ask me, so I just let it go, but if you have a well equipped garage it should only take 45 min or so to change em.

 

Today I went to Honda and exchanged the colder plugs (BCPR7E-11) to the normal plugs (BCPR6E-11). They took them back even though I had installed them.
They even installed and torqued down (13lbs) the new plugs for me, free of charge

 

Valve stem seals?