Only reason I was leaning towards the 2.5 as the reliability of my e46 with the 2.5. Its around 400,000 miles now with no motor issues and runs great and killer mpg. Though I realize the x3 is going to weigh a bunch more so the 2.5's mpg edge may vanish moving a heavier load and all.

I may end up getting another X5 but she likes the X3's interior at the moment (she changes her mind like the wind changes directions) but that may change.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install