If BMW offered a V12 in the X5 people would be saying how "underpowered" the V8 was. More power always feels better. I have the 3.0 and think the power is great for the daily drive. It's like plates at a buffet - some think they're always too small.....

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E70 X5 3.0si Space Grey

E36 Z3 2.5i Roadster, Sterling Gray Metallic