I'd say the valve stem seals are leaking. Also as far as those plug wires go they can be replaced as a set or fabricated from bulk wire and oem wire ends. If you promise not to tell anyone, we can "lend" you the tools for both jobs.
Peace

... and Don should know, chances are he's done "a few".

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Gone to the dark side

- Jeff

I used to just replace the spark plugs on my M103 every 2 months or so.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles