Shimano hydraulic disc brakes are extremely popular due to their ease of use, incredible braking power, and smooth modulation. Like all hydraulic brakes, they will eventually need to be bled though. If your brakes aren't delivering as much stopping power as they used to, or if you've just shortened your hoses and let some air into the system, you'll definitely want to perform a brake bleed. Not to worry! This bottle of Shimano Hydraulic Mineral Oil is just what you need to get your brakes working again in tip-top fashion. For the best performance, Shimano recommends using only Shimano-brand mineral oil when performing a brake bleed.
Don't try and get away with some off brand oil for your brakes. Buy shimano brand. The off brands can eat away at your seals. You have to make sure it's the right grade. Why take the chance? Just buy shimano.