If you're finding oil in your spark-plug wells and have already tried cleaning them out and snugging the valve cover bolts, you'll have to replace some seals.
FYI that there are actually two sets of seals that keep oil out of the spark plug wells, the valve cover o-rings, and another set below the rocker-arm cage. If you clean out the wells really well, you can sometimes see if it's the upper or lower seals which are leaking after a few miles by tracking in the wells.
The upper are simpler to do, try those first if you can't see which ones are leaking and if they don't solve the problem, you have to pull the rocker arm cage and replace the lower ones.
This video gives an idea (his torque values -among other things, are questionable, but it gives you an idea if you're doing this for the first time):
http://www.youtube.com/watch?v=wYU8qtPzQOY
Search the forums for more info and enjoy some miss-free driving!
FYI that there are actually two sets of seals that keep oil out of the spark plug wells, the valve cover o-rings, and another set below the rocker-arm cage. If you clean out the wells really well, you can sometimes see if it's the upper or lower seals which are leaking after a few miles by tracking in the wells.
The upper are simpler to do, try those first if you can't see which ones are leaking and if they don't solve the problem, you have to pull the rocker arm cage and replace the lower ones.
This video gives an idea (his torque values -among other things, are questionable, but it gives you an idea if you're doing this for the first time):
http://www.youtube.com/watch?v=wYU8qtPzQOY
Search the forums for more info and enjoy some miss-free driving!