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The xenon bulb allegedly have very long lives. My E39 (7.5 yrs, 94k) bulbs stayed alive. Auto enables the adaptive feature (responds to turns) which may or may not impact longevity of the aiming mechanism of the lamp unit (again E39 experience, a big pothole hit broke the auto level parts within the lamp). On leaves other lights on and drains the battery. Why not use your left hand, turn the lights on, off, or auto when road conditions would find adaptive headlights beneficial?
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