BMW F 650 CS Manual page 68

Fuel and lubricants
Brake fluid
3
66
Coolant
Capacity
F 650 CS
DOT 4
We recommend BMW brake fluids
e
Attention:
Use only new brake fluid to DOT 4
specification.
Brand-name long-life antifreeze
and corrosion inhibitor
e
Attention:
Use only nitrite-free antifreeze and
corrosion inhibitor.
1.3 l
(0.1 l in expansion tank)