Yep, that's it. Headlight washers can go through the fluid fast if you're on a wet highway treated with snow removal. I think they made the tank big enough to account for that and you get the same size whether you have the headlight washers or not.
Originally Posted by Fryguy29
I think it uses fluid at a higher rate than other cars I've driven. Maybe due to the headlight washers?
My 2003 325xi has the same, huge tank.
2013 X3 28i (prem, tech, cold1&2, conv, hud)