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[NiallyV6CDX]

Im doing that exact same job now and it takes quite a while to do, as you have to remove both the top and bottom intake manifold sections, multi-ram system as well as disconnecting and plugging the fuel lines and throttle coolant pipes ect...all in all very long winded but not particularly difficult, just a lot to do and lots of pipes to label!!!
If your cam cover seals are leaking you will probably find the spark plug wells are full of oil too, so you will need to empty all that out (I used a empty water bottle with a bit of small flexible rubber pipe to suck the oil out from the holes) and clean the surfaces and ignition coils etc. Also it is a good idea to check the condition of the manifold sealing rings (both upper and lower sets), which might need replacing.
I was quoted about 600 quid from my local specialist which i though was very OTT at the time but you can see why Also prices for new seals from Vauxhall seem to be ridiculous, so its probably worth shopping around for some sensibly priced ones.
That said, while there is a lot to do, its not especially difficult and you will save yourself and absolute packet, but plan on having no car for at least 3-4 days, if your spending your afternoons doing it.

[Martin_1962]

Your valve seals have probably gone as well, just like mine and Mike Dundees

And mine  

that begs two questions:
How do I know if these need changing?
How do I change them - I've looked for a guide on how to do it but can't find one?

Lots of bluey/grey smoke on start up and oil needs topping up more than normal.

Phew, I've not got the blue/grey smoke and the oil seems fine now that the CCG have been done.

Yours isn't a 2.6

[Marks DTM Calib]

Im doing that exact same job now and it takes quite a while to do, as you have to remove both the top and bottom intake manifold sections, multi-ram system as well as disconnecting and plugging the fuel lines and throttle coolant pipes ect...all in all very long winded but not particularly difficult, just a lot to do and lots of pipes to label!!!
If your cam cover seals are leaking you will probably find the spark plug wells are full of oil too, so you will need to empty all that out (I used a empty water bottle with a bit of small flexible rubber pipe to suck the oil out from the holes) and clean the surfaces and ignition coils etc. Also it is a good idea to check the condition of the manifold sealing rings (both upper and lower sets), which might need replacing.
I was quoted about 600 quid from my local specialist which i though was very OTT at the time but you can see why Also prices for new seals from Vauxhall seem to be ridiculous, so its probably worth shopping around for some sensibly priced ones.That said, while there is a lot to do, its not especially difficult and you will save yourself and absolute packet, but plan on having no car for at least 3-4 days, if your spending your afternoons doing it.

I wouldn't!

I have tried FAI, Elring and a few even cheaper ones....noen of them lasted!

[Rob James]

Your valve seals have probably gone as well, just like mine and Mike Dundees

And mine  

that begs two questions:
How do I know if these need changing?
How do I change them - I've looked for a guide on how to do it but can't find one?

Lots of bluey/grey smoke on start up and oil needs topping up more than normal.

Phew, I've not got the blue/grey smoke and the oil seems fine now that the CCG have been done.

Yours isn't a 2.6

Mine is the 3.0, what difference does it make to the valve seals and knowing if they need changing?

Cheers.

[Marks DTM Calib]

Your valve seals have probably gone as well, just like mine and Mike Dundees

And mine  

that begs two questions:
How do I know if these need changing?
How do I change them - I've looked for a guide on how to do it but can't find one?

Lots of bluey/grey smoke on start up and oil needs topping up more than normal.

Phew, I've not got the blue/grey smoke and the oil seems fine now that the CCG have been done.

Yours isn't a 2.6

Mine is the 3.0, what difference does it make to the valve seals and knowing if they need changing?

Cheers.

Not an issue on 3.0 or 2.5, it only affects a small period of production on the 2.6 and 3.2