I'd drive it around too and see how long it lasts. Can't hurt. Worst comes to worst part it out and have a bunch of good parts for your other w123.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k