i was thinking the same thing.. but i guess it burns oil? i had to add a qt 2 weeks ago.
Current 2012 e70 x5 35i -jb4
2008 335xi e92- Sold
2007 335i e90 - Sold
2003 E46 M3 Vert. Taig on Black 6spd- Sold
2002 Taig / Red / / / M3 - SOLD