The problem with preemptive relplace is that you may just install a pump that has 3000 miles of life. My first replacement pump lasted 10 months (replaced under warranty still going). I bought a branded Bosch to replace the other car's much older one at about 185k miles, and when I went to install was DOA. Aaaaghhh. So I would recommend a spare that you plug in once before putting in the trunk :-).

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)