Vent hose for washer reservoir, it is open and not connected.

One of: - worn turbo - stuck or worn piston rings allow blow-by gases in crankcase Any ways I can test for either one at home? Remove turbo intake pipe, wiggle turbo by hands. If the cartridge is short, it will blow oil into intake. Also pay attention to PTC nipple. If it's covered with oil and the...

I would raise the car , get under the turbo and inspect the oil drain pipe top gasket, also the oil feed line.
If the drain pipe is leaking its obvious.

cinch down the charge air pipe coupler band clamps at the turbo end.
Mine is usually wet with oil.