hi all, i have the fwd 1.8tfsi, 4700kms does anyone hear a sort of hissing (pressure release) sound that pulses (hisss stop hiss stop etc.) when they switch off their engine when returning home from a trip with the car?? the sound only lasts a couple of seconds . I am not sure if it is venting pressure from the turbo that might still be spinning slowly ( i do give a minute or 2 spool down time before i switch off) i also noticed a very very mild oil stain on the plastic shield right below the oil fill cap. The cap seems to be spring loaded as well. I hope i do not have some kinda back pressure problem. car doesnt seem to be burning any considerable amt of oil either. Car drives fine tho. any ideas?