Just have it checked by a reputable Mercedes mechanic, so they can look all under the car, check for tranny leaks, and test the compression of the engine. Weak compression means a rebuild may be needed soon. Does he have all service records?
-Joe

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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.