If your breather works the same as the one on my Deutz Allis 7085, it routes in back into the air intake ahead of the turbo for recycling. If I remember correctly, there is a valve in there to prevent the turbo from sucking oil up the breather tube. It basicly allows crankcase pressure past the valve, but prevents the turbo vacuum from drawing on the breather. This valve may have gone bad and the turbo is sucking oil out of the crankcase. Mine went bad so I re-routed the breather to vent like a "normal" engine.