I just installed (1k miles ago) a new PCV breather box on my '05 V70 2.4i. I traced a large oil leak to the right angle short hose on the top of the new breather box last night. When I installed it, it did not seem under great tension, though I did (gently) use a rubber mallet to snug the fit of this connection on the front of the engine. I also did not overtighten the jubilee/hose clamp. Is there some trick to installing the PCV box that I am unaware of, or do Volvo rubber parts sometimes fail like this out of the box?