Right went to audi this morning to pick up service parts for servicing my a4 b7 2.0 tfsi quattro. Before i removed the oil filter housing i had noticed over past couple of weeks there was small leak coming from the bottom. This afternoon i have just replaced oil and oil filter with new seal. i have just checked and noticed that i am still loosing a small amount of oil from bottom of oil filter housing. i am predicting that the little seal at the bottom of the filter, which is on the orange part where the oil drain hose screws into has perished??? Does anyone know if this is a replacable part of whether a new oil filter housing is required?? Any help would be most appreciated!!!