GeezingInVA
Well-Known Member
One thing I liked about my 09 Mercedes ML350 was that bi-xenon headlights had built in auto leveling so it didn't matter if you had weight on the hitch or people in the back they always pointed at the same spot on the road.
I honestly think that that the factory just installs the headlights as the come from the manufacturer and the dealer is supposed to check the aim as part of their inspection before delivering the vehicle. I suspect most don't have a rack for checking headlights or they just don't use them if they do.
My 2005 Mercedes SLK350 roadster also has auto leveling bi-xenons, and they work perfectly every drive.
Here in VA, during the mandatory annual safety inspection, I suspect as long as my '16 Limited's headlight alignment doesn't stray too far into the oncoming traffic lane quadrant, they don't recommend any adjustment for optimum distance. If the alignment is off even a tiny bit into oncoming traffic, though, they red-flag at the inspection, and you have to get them re-aimed.