Both engines in the 1993 Cougars (V6 or V8) operate just fine on 87-octane fuel.
R134a
It came from the factory with ( 5W-30 )
Use Super Premium SAE 5W-20
if your 94 cougar has the 4.6 v8 u can only use the trans from a 94 or 95 cougar or thunderbird with the 4.6 v8
What type of freon does a 1993 cougar use
Manual transmissions dont use fluid, they use a kind of grease.
Poor fuel or water in the fuel. Using the wrong octane fuel.For the 2001 you should use Unleaded fuel only.87 to 91 octane.
According to the 2000 Mercury Cougar owners manual ( 5W-30 ) for the four cylinder and V6 engines
5W30 full synthetic.
1991 mercury cougars use shocks and struts
5 qts
r134a