I don't think you understand what I was explaining. The PCV system, if left standard, is not the issue. It's the excess oil that ends up in the intake system if there is excess blowby. Ford have semi tried to fix this by recommending removing the intake pipework to the turbo and cleaning it every 15000km service on the FG, but it is still an optional task. This build up of oil does sap power as it interferes with good air fuel mixtures. While it might be minimal, it is still present.