oliverheld1

Mercedes ML Diesel Low Oil Pressure and Engine Knocking

My 2011 Mercedes ML diesel is giving me grief. The low oil pressure warning light is on, and I hear disturbing mechanical noises from the engine. It's done 125466 km. The oil level is fine, and I changed the oil, but the issue remains. Could it be oil pump failure or engine bearings?

4 comment(s)

That sounds familiar. I had a similar experience with my ML. The low oil pressure light is never good. Was the new oil the correct spec? I'd be worried about oil pump failure or worn engine bearings. What kind of mechanical noises are you hearing?

The oil was the correct spec. The noise is a loud knocking, like something is loose inside the engine. Did yours make a similar sound?

Knocking is what I heard. It was the oil pump not providing enough pressure. I didn't drive it much after the light came on, and I suggest you don't either. Get it to a workshop to confirm, but it sounds like oil pump failure.

I took it to a workshop, and you were right. It was the oil pump. I got it replaced, with new oil and filter. Total cost was 755€. Hopefully, that's it!

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