Poor idle quality due to oil feed tubes falling into crankcase on Mercedes-Benz E420

Oil feed tubes break and fall into the crankcase (engine) and the tappet becomes noisy (ticking), resulting in degraded idle quality. Our technicians recommend replacing all of the tubes at the same time, broken or not.

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Average mileage: 129,836 (72,000–179,000)
3 model years affected: 1994, 1995, 1997
12 people reported this problem
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problem details
1997 Mercedes-Benz E420 104,856 mi,
Light knock off and on when engine idling. Had all tubes replaced and it has worked fine since. I have 135,000 on it now. Cost $650