Vauxhall Corsa 1.7 Diesel - oil in the air inlet manifold - nutttytart

Hi recently had my car serviced and found a oil leak that turned out to be a clip that had come loose.. however when investigating further I found that there was oil and small particles of metal in the air inlet manifold... how serious is this and can it be cured... the car is not loseing oil and has not lost power and not emitting any smoke at all from the exhaust...

can anyone advise... Do I need to get rid>?

Vauxhall Corsa 1.7 Diesel - oil in the air inlet manifold - Avant

Moved to Technical.