BMW M6 Convertible Owner's Manual page 198

Reference
Capacities
Fuel tank
Windshield and headlamp
washer system
198
Technical data
US gal/liters
US quarts/liters
Online Edition for Part no. 01 40 2 903 192 - 07 12 490
Notes
approx. 21.1/80 Fuel quality, refer
to page
approx. 5.3/5.0
160