BMW 2004 K 1200 S Rider's Manual page 136

Fuel and lubricants
8
Transmission
134 Transmission oil
Fuel
Fuel grade
Content of fuel tank
Reserve volume
Brakes
Brake fluid
joint oil circuit with engine
Premium grade unleaded fuel (98 ROZ/RON;
88 MOZ/MON)
19 l
4 l
DOT 4
We recommend BMW brake fluids