A couple of weeks ago, both low-beam H7 headlight bulbs burned out the same day. These bulbs lasted about 650 hours (26,800 miles) of use. After putting in both spare H7 bulbs I carried in the trunk, I checked with the local dealer about this.
Seems there is a warranty upgrade to prevent this from happening. A replacement wiring harness has a voltage regulator chip in it that limits voltage to the headlights to 12 VDC. This prevents voltage surges during start-up from stressing the filaments and shortening the bulb life. Two replacement H7 bulbs are included. Installation time is about 10 minutes. And it's free, too.
S80 owners who've had short-life headlight bulbs might check with your local dealer for a fix to this problem.
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