Posted by Tony Sefton on November 17, 2008, 7:42 pm, in reply to "Re: VOLVO V70 2.2"
If its got a Sealed Breathing system like BMW's, ( I would think it has ). It Could be caused by the Rocker cover gasket.
If it can leak oil out, it can also suck air in. ( And if you put Smoke into the Manifold and it comes out of the rocker cover then it proves that there is a way through )