Coil cover gaskets/grommets.
Replaced coil cover gaskets today after reading about water infiltration, but the originals were in fine shape. The bigger issue I think is making sure that the coil wiring lead grommets in the valve covers are fitted right; they are formed to fit the opening. Replaced plugs last year and found them out of place with water spots in several coil/plug sockets at the firewall. Removing coils can get the grommets out of place pretty easily.
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