Poor idle quality due to oil feed tubes falling into crankcase on Mercedes-Benz S420

Problem Description and Possible Solution
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.
Problem Data
RepairPal Verified
Average mileage: 50,500 (16,000–85,000)
6 model years affected: 1994, 1995, 1996, 1997, more1998, 1999
9 people reported this problem
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Oil tube ends popped off resulting in lowered oil pressure and ticking noise. Replaced myself with upgraded steel tubes