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

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: 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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1997 Mercedes-Benz S420 85,000 mi,
Oil tube ends popped off resulting in lowered oil pressure and ticking noise. Replaced myself with upgraded steel tubes