Is the diesel ratio 3.91?

Available Drives: 3.62 | 3.91 | 4.10

A 3.0i with 3.91 probably won't feel a difference. However, the 3.62 is an 11.7% change. For super long road trips, ~2150 RPMs at highway speeds is sweet.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)