https://www.hagerty.com/apps/valuationtools/1999-Mercedes~Benz-E300-Diesel

As of Sept. 4, 2020
#1 Concours (Showroom condition): $9200
#2 Excellent (could win a local show, no defects): $6900
#3 Good (Has some age, not perfect, but runs well and looks good for its age): $5200
#4 Fair (aged daily driver): $3500

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.