2003 Cadillac CTS Owner's Manual - Page 349

Hydraulic Clutch It is not necessary to regularly check clutch fluid unless you suspect there is a leak in the system. Adding fluid won't correct a leak. A fluid loss in this system could indicate a problem. Have the system inspected and repaired. Refer to the Maintenance Schedule to determine how often you should check the fluid level in your clutch master cylinder reservoir and for the proper fluid. See "Owner Checks and Services" and "Recommended Fluids and Lubricants" in the Index. How to Check and Add Fluid Make sure the fluid level is at the MIN line shown. If it isn't, remove the cap and add the proper fluid until the level reaches the MIN line on the side of the reservoir. When to Check and What to Use The hydraulic clutch reservoir is located in the engine compartment on the driver's side, near the brake master cylinder reservoir. See "Engine Compartment Overview" in the Index for more information on location. 6-23