OM651 (2014 Viano)

[m80]

At the connection to the intercooler, n/s below the throttle valve, do they always seep oil?

Am I wasting my time trying to get this to seal?
Even after fitting new 'o' rings some miles ago it still weeps.

 

[OneForTheRoad]

It's possible that the intercooler is swimming with oil inside , can you remove it and clean it out . This was a problem the VW Passat I once owned had.

 

[m80]

It's possible that the intercooler is swimming with oil inside , can you remove it and clean it out . This was a problem the VW Passat I once owned had.

It was clean when I fitted the new seals.
I reckon it is where oil in the intake system pools a little when the engine is stopped. And will clear easily enough when started.
Oil level doesn't drop.
DPF doesn't regen too regularly.
So I reckon the engine is running well enough.

But do others see the oily deposits around that joint?