Oily intake manifold

Hi,

"I've noticed an increasing amount of knocking during engine operation in my 1.9 MJet 16V. It also vibrates slightly under full load. Because I've detected a diesel smell in the last few days, shortly after turning off the engine, I removed the cover today and took a look." I could not detect any fuel leaks, however, the intake manifold is coated with oil mist on two cylinders near the common rail pump.

Should I have that checked out? Maybe a valve isn't working properly? Or is oil mist after 15,000 km normal?

Error found. A pipeline was leaking under full load. Now he's purring again.