I voted for petrol green since my 82 300D is the same color and it always received compliments. Though they're not listed, may I also suggest 881 silberdistel/silver thistle (my 300SD is that shade), 587 pajettrot/Cabernet Red, or 199 schwarzblau/Black Pearl.

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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.