The guys down at the dealer told me I didn't need to purchase any fancy MB Power Steering fluid, they told me to use "McParts" Power Steering fluid in it. I figure they know what they're talking about, at least two of them have 1980's era diesel MBs.

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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.