HELP! Fiat Punto Deisel van 1.9

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Oil all over my new drive

Have a problem with the above punto van as in it is leaking oil from the top of the air filter box.

It seems it is fitted with a metal hose that sends spent heat back towards the engine to make it more economical to run.

I have been told however that instead of burned gases being past through this metal hose, oil is being forced through instead, which in turn is causing the oil leak.
Does anyone know what could be causing this this and what would it cost on average to get fixed.
I don't know if a seal has been blown in the engine or is it a piston ring fault.
When i remove the oil cap cover compression can be felt blowing out the filler cap.
Thanks in advance
 
Sounds like it could be excessive crankcase pressure - perhaps the piston rings are past their sell-by date.
 
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