A PO ground off the tabs on one of my valve covers...luckily they press in pretty tight and there was no impact.A simple spark plug change / bad ignition coil became much more when I pulled out a coil and noticed oil in the tube. I pulled the valve cover and sure enough, some idiot mechanic had simply forced the grommets in the slots without bending back the tabs. The grommets on the leaking tubes were ripped in places letting oil thru. I punched them out easily enough, but you can see from the image how the tabs were bent in. Pulling the other side this week as I know what I'll find.
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