Was the old bearing grinding? What are the warning signs........so far it seems to operate smoothly/quietly on our 300E.....I am looking for a pre-90 junkyard car so I can get the setup that has no pump and swap it on. Then no worries!

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'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
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'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)