They don't make the metal oil caps anymore, only plastic, though the metal fuel caps they still make are the same thing as the old metal oil caps, so you can buy one of those.

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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.