Really if you have the genuine gasket torqued up correctly you shouldnt need any sealant at all but you may have crushed the gasket now so a little may be needed just dont go OTT with it.

Best off going to an autofactors and asking for a decent hammerite sealant, tell the bloke what its for and he should recomment the best one.

theres no sealer on it at the moment as i put a fresh gasket on yesterday.im going to go out and take it back a part in a min and i will try what you have said.any specific sealant you would recomend?

hmmm may sound silly but when you did the gasket you did scrape off any old sealer etc etc off the mating face where the new gasket sits didnt you?

If i was you id:
1) Get the rocker cover back off tonight
2) Clean the mating face up thoroughly but dont score it!
3) Clean the gasket up getting all silicone off (be fine if it was only fitted yesterday)
4) Get some propper decent gasket sealer to put under the gasket where it leaks (not too much! dont want any going in the block
5) Torque the rocker cover up propperly and let it set for an hour then let the car warm up, no revs! then leave it over night.

yeh not doing them too tight or too loose and making sure they are all done up.its always in the same place though and once it starts leaking it piss's out everwhere

[Edited on 04-05-2007 by sri power]

Are you torqing the rocker cover back on correctly?? i.e not too tight and in sequence so one side isnt tighter than the other?

first time i used a payen gasket wich are quite good gaskets and i still leaked so i tried a bit of black silicone on it and that didnt work.so yeterday i went to vauxhall and got a proper gasket it stopped leaking for a while but as soon as i put my foot down it started pissing out again:boggle:

you using genuine vaux gaskets or cheapys off ebay? I put an ebay one on mine and it was crap.

I wouldnt use silicone, use a decent sealer (not instant gasket)

Also are you tightening the rocker up correctly?

yep checked those

Sure its not the camshaft oil seals?

any one had a problem with theyre rocker box leaking oil on a c20xe?ive tried 2 new gaskets and tried using a bit of silicone.its leaking at the front onto the timing belt.