SAE 5w30 any major brand.
5w30
Mercon V
5W30 full synthetic.
According to the 2000 Mercury Cougar owners manual ( 5W-30 ) for the four cylinder and V6 engines
For a Mercury Cougar , 2.5 litre V6 engine : According to the 1999 to 2002 Owner Guides : ( Motorcraft FL-820 engine oil filter )
On a 1991 Mercury Cougar : The oil pump is INSIDE the oil pan ( the oil pan is bolted to the bottom of the engine )
According to the 1999 Mercury Cougar Owner Guide : ( 5W-30 ) is used in the 2.0 litre four cylinder engine and the 2.5 litre V6
According to the 1996 Mercury Cougar Owner Guide : ( 5W-30 engine oil is the PREFERRED oil forthe 4.6 liter V8 and 3.8 liter V6 ) * with engine oil filter change , 5.3 U.S. quarts / 5.0 liters of 5W-30 , the engine oil dipstick is used to determine the exact fill requirement
5w 30
near the oil filter
with your eyes
You need an oil change.