Well it leaks more when driving harder simply because you're running higher oil pressures when doing so. You normally have to have quite a flow of air blowing by before it becomes problematic.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k