It really depends on how long (time, not mileage) is left from the warranty, and what condition the individual SAV is in. You can have 40k miles left on the warranty, but when it expires in a year, and you only drive 10-15k per year, 40k warranty doesn't mean much to you.

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Currently driving: 2011 E70 x35i , 2011 E90 335d
Previous BMWs: 2007 E90 328i , 2005 E53 3.0i, 2011 F10 535i (6spd manual)