The rocker cover gaskets, they shrink up over time and leak, usually the rear drivers side on a V6 or V8 is the first spot. You can try tightening them up and stopping the leak, it is the cheapest route to take, but you will probably have to replace the cover gaskets, they do not come off easily. You have to remove the intake, most of the time. Then pull the covers, replace the spark plug seals, then the rocker cover gaskets, put it all back.Use no sealer to put them back on. No more leak. Hope this helps.
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