Yep, tested the PCV valve. Removed from ebgine while its idling, and had a strong vacuum present. Just as the manual says. The ball inside does rattle and roll with it off the hose when i shake it. I've also checked the Oil pressure relief valve on the Oil filter adapter, and it does slide freely in its cylinder <img src="/forums/images/graemlins/smile.gif" alt="" />

Been told be other "reputable" people its the oil control rings that have collapsed, and its the combustion pressure that blowing the seals and pushing the pressure up ( or down, as in down into the crankcase ).

Anyone think thats the right diagnosis?

Regards.
Adam.