you dont add clutch fluid. If the clutch is slipping that means that you need to buy a new clutch
On the firewall drivers side. Clutch runs from the brake reservoir
How to check the transmission fluid in a 1995 Mazda 626
The reservoir is located on the master cylinder in a Mazda 626. To add fluid, simply remove the reservoir cap and pour fluid in.
I'm not positive about the '99 model year, but the hydraulic clutch shares the fluid reservoir with the brake system in earlier Mazda models.
The 1994 Mazda 626 was built with 4 and 6-cylinder option models. The CD4E transmission has a fill of 7.4-quarts (qts). The GF4A-EL has a larger capacity of 9.3-qts.
The brake fluid reservoir on a 1989 Mazda 626 is on the master cylinder. This is located in the engine compartment on the drivers side.
Dextron III or IV
most washer fluid pumps are on the resivour itself
down the dipstick tube
DOT3
Automatic Transaxle (new unit fill capacity less torque converter) 1998 626 4 cylinder engine = 6.0 quarts 1998 626 V6 engine = 7.2 quarts Manual Transaxle = 2.9 quarts