According to the 1999 Mercury Mystique Owner Guide :
With engine oil filter change :
The 2.0 litre four cylinder engine takes ( 4.5 U.S. quarts of 5W-30 )
The 2.5 litre V6 engine takes ( 5.8 U.S. quarts of 5W-30 )
According to the 2000 Mercury Mystique Owner Guide ( 5W-30 )
D O T ( 3 ) brake fluid
castrol 10 w 40 high mileage
It has a hydraulic clutch ( the brake fluid reservoir is also the clutch fluid reservoir )
According to the 1999 Mercury Mystique Owner Guide ( 5W-30 ) With engine oil filter change : The 2.0 litre four cylinder engine takes ( 4.5 U.S. quarts of 5W-30 ) The 2.5 litre V6 engine takes ( 5.8 quarts of 5W-30 )
I believe there is some kind of release to the left of the drivers seat in the area of the rocker panel
( 5W-30 ) in your 2.0 liter four cylinder or your 2.5 liter V6 engine
According to the 1999 Mercury Sable Owner Guide : ( Motorcraft MERCON-V automatic transmission fluid ) ( to confirm the type used , it should be engraved in the automatic transmission fluid dipstick )
Pads on front, drums or pads at rear. Ask at a good auto part store with year of car
For a 1999 Mercury Grand Marquis : ( the engine air filter is Motorcraft FA-1668 )
slave cylinder locationin the Mercury mystique the slave cylinder is located in the transmission. it is connected to the release bearing. the onbly way to change the slave cylinder in this perticular car is to pull the transmission. stupid desing but its a ford so this kind of briliant thinking is expected..lol
Conventional drum brakes.