Goodluck!
The m119 stuffed in to the w124 is a PITA to work on.. I suspect there are a lot of 400/420e's out there with leaking PS because of this.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D