BMW M3 Owner's Manual page 147

Capacities
Fuel tank
including reserve of
Window washer system
including headlamp washers
Online Edition for Part no. 01 41 0 014 956 - © 02/08 BMW AG
US gal/liters approx. 16.6/63
US gal/liters approx. 3.3/12.5
US qt/liters approx. 4.8/4.5
Notes
Fuel grade: page 101
For more details: page 52
145