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oil on spark plug no4 why?

my vauxhall corsa 1.2 03 reg its done 44 k only it has a slight miss on engine the exhaust tail pipe fluters smoke no 4 spark plug is oily
ali, April 2010
Hi Sounds like either valve stem oil seals worn or piston rings.
Hope this helps.
Regards.
Kevin.

Kevin, April 2010
link Click here to see other fixes for Vauxhall Corsa 1.2.