Hi notice last week few drops of oil on the floor put in some wynns oill leak seal now got smoke under bonnet had a look and theres oil dripping just below oil filler cap under what looks like a plastic housing any advice would be grateful :y

Hiya seems as if your cam cover gaskets are fubbered.
Smoke is from oil getting on the exhaust manifold.
Never a good idea putting additives into the engine as most causes problems later.To cure your problem replace the gaskets. :y

Thanks  :y would this be the rocker cover gasket ? as someone has since told me,and can i just replace the one or do i replace the pair?

have a look here  http://www.omegaowners.com/forum/YaBB.pl?num=1152564281

bert wrote on 15. Apr 2011 at 13:24:

Thanks  :y would this be the rocker cover gasket ? as someone has since told me,and can i just replace the one or do i replace the pair?

You can just replace one side. The most important thing to do is to clean out the breather system as this has probably caused the cam cover gaskets to fail in the first place

Thanks very much for your help  :y

Just got a new rocker gasket from vauxhall come in 2s only 30 odd quid  ;D