check your front tranny seal. This is a $12 part but you have to r and r the tranny to get to it. if it is the rear seal you can do that with tranny in. but it is usually the front one. Nothing you can do about it I am afraid. The pan seal can also cause this but the shop should be able to see this and it is an easy fix.
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)