BMW 2007 X3 Owner's Manual page 100

Important components in the engine compartment
1 Filler neck for washer fluid of the headlamp
and windshield washer system, refer to
page 42
2 Body ground, negative terminal, refer to
page 114
3 Jump starting terminal, refer to page
98
Online Edition for Part no. 01 41 0 013 638 - © 03/07 BMW AG
4 Filler neck for engine oil, refer to
Adding engine oil
5 Reservoir for brake fluid, refer to page
6 Expansion tank for coolant, refer to
page 101. In vehicles with a gasoline
114 engine, the expansion tank is on the other
side
101