1. The described problem affects several VW models with 1.6 or 2.0 diesel engines. The oil leak is caused by oil traveling along the flywheel mounting bolts or, in the case of an automatic transmission, the flex plate.
2. Remove the transmission and flywheel or flex plate. Clean the threads of the crankshaft flange.
Apply a small amount of sealant to the thread of the fixing screws, as shown in:
Figure 1 – for vehicles with a flex plate
Figure 2 – for vehicles with a flywheel
Do not use an impact wrench to tighten the screws. Make sure that the screws are tightened to the correct torque. Install the transmission.