When I bought my b12, the previous owner said there was an oil leak
from behind the engine. I got the car off the ground and started cleaning
the engine to spot the leak. Turned out to be the Oil Filter! Someone
didn't put it on right after an oil change. I changed the oil and filter and
she hasn't leaked since.
It was running down the engine and dripping from right around the area
you described. I wouldn't have guessed it as a filter problem from the
location the oil was dripping to the ground. Have you checked that your
filter? I was surprised...but happy.