Audi Repair Questions? Ask a Mechanic for Answers ASAP
The 1.8T has a couple common points in the PCV (positive crankcase ventilation) system that tend to break. I understand what you are saying about it breathing through the dipstick tube, and it is possible that the vacuum amplifier is also faulty and sticking.
The PCV hoses under the intake manifold, including the Y pipe at the end of the valve cover gasket tend to get brittle and break, we replace all of these at the same time as trying to do one piece at a time usually breaks the next piece in the chain.
The vacuum amplifier is a small black plastic cylinder, a hose at each end and one coming out at an angle, also installed into one of these vacuum hoses coming from the intake manifold but usually mounted above the manifold or between the runners.
The parts can be different, depending on your engine code- and most online parts dealers don't even have them, it's a situation where you will have to go to the dealer parts dept. Just tell them you are doing the PCV hoses and they will give you everything, it is about $500 in hoses, seals, tubes, etc. Remember the vacuum amplifier.
As long as you don't run out of oil you should be OK.