Just like the VW, these are grease retainers, not seals in the strict sense. They allow dirt at water to migrate in, and you really need to push the old grease out as a result. I've never seen any grease come out anywhere on the steering knuckle fitting, but all the rest have blown out some grease.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!