You really don't need to use a fuel additive. The car should run fine on just regular old diesel fuel. MB does not recommend any fuel additives, or oil additives.
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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.
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