Oil leakage

Can any1 help
Where this oil could come from its behind the engine block where turbo is attached
1.9tdi 2009

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I am unfamiliar with the Touran, but for BRM engines on TDI Jettas, it is my understanding and experience that leaks there are most often from loose cylinder head covers. Re-torque yours to the specified setting and see if that solves the issue.