Sp far I think it has slowed the leak down to a more manageable level for me. Before I was adding PS fluid every 3 or so days. Now it's more like every 2 weeks.

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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