That nipple where you have the filter hooked to has no baffling behind it to stop oil vapor from coming out through there. That is why there is a check valve on the stock piece that goes to the intake. There is supposed to be a one way flow of air from the intake to the valve cover through that hose only, so no baffling is needed on the back of that nipple. The nipple on the front of the valve cover has to go through a bunch of baffling inside the valve cover to catch oil vapor, sort of a built in catch can.
None the less, if you are getting excessive oil out of that nipple the only cause I can think of would be a big increase in crank case pressure caused by blow by in the engine. You should also check the inlet to the turbo for oil also, as you should be getting more coming out of the nipple on the front of the valve cover also. Most likely if you remove the black plastic intake tube you will find oil where it meets the turbo inlet. Do a compression and leakdown check, I am guessing that will show you what is going on with your engine.
Since the fuel is directly injected into the cylinder, there would be no way to pressurize the top end of the engine with fuel pressure. If he is getting blow by from one or more cylinders, most likely that is where the fuel is also getting into the bottom of the engine and oil causing the smell.
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