What kind of hydraulic fluid should be used for replacing the clutch master cylinder fluid on a Datsun 240z?

For replacing the clutch master cylinder fluid on a Datsun 240Z, you should use a high-quality DOT 3 or DOT 4 brake fluid. Both types are compatible with the hydraulic system, but DOT 4 has a higher boiling point, providing better performance under extreme conditions. Ensure that the fluid is clean and free of contaminants to maintain the integrity of the hydraulic system. Always check the owner's manual for specific recommendations.