I have noticed that ever since i hav eowned this car that it uses a little oil. I've noticed that some of the oil is being sucked back through the pvc that you hook into the v2 air filter. I s there a valve that would allow air to flow through and not oil. Its not alot of oil either. I don't wanna just put a filter on there because the negative psi on the crank case is supposed to help the rings seal. which is important for boosted cars.