One of the coils on my '02 Boxster S has some oil seepage. Is the "tube" you mention in this artcle the problem? If so, what's the part and is it replaced while doing the plugs. My mechanic thought it was something with the coil and quoted a price of $6-700 to replace, but it seemed strange that there would be oil there.
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Pelican Technical Article: Replacing Boxster Spark Plugs and Coils - 986 / 987