That is most likely the valve covers... When my gaskets went bad I was actually losing 1 quart per month through the valve covers.. replaced mine at 180K and they were hard and brittle and had cracked in a couple different places... You'll need the valve cover gaskets , a plenum gasket (had to get mine from dealer like $6) also since you'll have to pull the plenum to change the valve cover gasket on the left side, it's a great opportunity to change the plugs hassle free. Number six plug is a breeze with the plenum out of the way =)

Just know the plenum can be quite the b!t(# to get off, namely the coolant hoses on the back side next to the firewall...

Good luck hope this helps