Indeed .... that's one scenario I'm prefering not to think about
Gradually working through the possibles with the cheap and accessible ones first ... but eventually I'll have to bite the bullet, remove a load of plastic and delve down the back of the engine .... what is strange is that it smokes when cold and once warm neither hard acceleration nor hard engine braking effects the smoke .... wouldn't those more expert than me expect the manifold vacuum to draw more oil past the seals into the intake side on over-run and hence give more smoke if the seals were gone??
K