Document: Leaking oil lines, all V6 TDI engines up to model year 2000 (Solution)

2.5L V6 TDI.
Fuel loss due to detached or leaking oil lines.

Cause:
The oil feed lines consist of a rubber hose that is wrapped with a fabric for stabilization.
Due to embrittlement of the material and tearing of the rubber hose, the oil drain lines can detach from the connections of the injector or the distributor injection pump.

Procedure:
To prevent leaks from the oil supply lines, the following points must be strictly adhered to:

If a pipe is disconnected during a repair, it must generally be replaced.

Repair measures involving cutting and reattaching are...
to be excluded. This is necessary because the removal process creates tiny cracks that no longer guarantee a secure fit on the connector.

When replacing, use only the hoses included in the set.
Use part number 059 198 998 B. Under no circumstances should the...
visually almost identical cables with other spare parts.
"are being installed with specific part numbers."