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You need rocker cover gaskets. The set includes some felt pucks that sit at the bottom of the tube you looked down to see the oil.
You have to take the intake off which is time consuming... which means you should do it.

hmm...okay. Sheesh Im freaked out. I love my car, and never had any problems with it, I just wanted to change the plugs since im close to 100K miles. Are there any good instructions on how to do this somewhere?