What fluid do you use for a clutch slave cylinder?

For a clutch slave cylinder, you typically use hydraulic fluid that is specified by the vehicle manufacturer, which is often either DOT 3 or DOT 4 brake fluid. Some vehicles may require specific hydraulic fluids, such as mineral oil or synthetic fluid, so it's important to consult the owner’s manual for the correct type. Using the wrong fluid can lead to damage of the hydraulic components. Always ensure the fluid is clean and at the proper level for optimal performance.