The question of CPO or not highly depends on the car in question and your driving habits.

With that low mileage, on a manual 3.0, with your low miles expected driving , I personally would NOT go for the CPO or extended warranty, especially since you still have an additional month or so of original warranty left on the car, which allows you to take care of any immediate issues that they car might have.

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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)