I HAVE OIL IN THE VALVE COVER TUBE ON #4 CYLENDER CAUSING MISFIRE on 2004 Nissan 350Z

eNGINE LITE IS ON CODE #4 PLUG IS MISFIRING I CHANGED THE PLUG AND OIL WAS IN THE TUBE AND THE DEALER IN CRYSTAL FL TOLD ME I NEED A NEW VALVE COVER 275.OO WHATS WRONG HERE??

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1 answer
Oil leaks through the valve cover/spark plug tube gasket into the spark plug tube.
You need to have it replaced.

Zee