Renault master 2.5 dci

Hi we have a master van 2.5dci turbo and it's loseing water straight into the oil at a speed you can see, now I've been told that there's internal core plugs behind the external core plugs and I was just wondering If this is true or if there's something else going on I can't see it being headgasket as I mean the water runs straight into the oil when it's cold any ideas or thoughts would be great cheers ben

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Renault master 2.5 dci