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Q:

Problem with a miss on #6 cyl.
. on 2004 Mercedes-Benz S600

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Replaced the coil pack with same result. Spark plugs on #6 showed some
oil. One plug was carbon fouled. Any suggestions what to check for the oil.
(1) Answer
start with a wet and dry compression test. it will verify rings. if that is ok, it could be valve seals or bad guides

Roy