Lift the car and confirm where you leak is, then follow to your source. If it is the oil pressure line it is easy to access from the top and you should see loads of oil spray on the back of the engine and fire wall.
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)