W210s are better than w124s. I plan to sell mine. A lot more vacuum issues, more complex suspension, leaky steering box etc

The only thing a w124 has on a w210 is less prone to rust cause of the crappy paint they use. Aeshetically the w210 is better to look at.

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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