Original Shimano mineral oil in 1000ml package to refill disc brakes. Shimano mineral oil is a suitable brake fluid for all Shimano hydraulic disc brakes, whether MTB, Road, Gravel or Touring. Since it does not bind water, mineral oil has the advantage over DOT of longer constant quality - you do not have to replace it as often. When servicing the brakes, please ensure that no oil gets onto the brake rotors.