5w 30
at the bottom of the oil pan under the car.
According to the 2001 Mercury Cougar Owner Guide : For the 2.0 litre four cylinder engine : ( with engine oil filter change , 4.25 litres / 4.5 U.S. quarts of 5W-20 engine oil )
Use Super Premium SAE 5W-20
In a 1995 Mercury Cougar , 4.6 liter V8 engine ( 5W-30 ) * according to the Owner Guide
On a 1991 Mercury Cougar : The oil pump is INSIDE the oil pan ( the oil pan is bolted to the bottom of the engine )
Synthetic oil can boost your horse power. Also fuel additives.
The oil drain plug is located under the front end of the car, on the rear side of the oil pan.
5w30
5w 20 ======================================================== The above answer of 5W-20 is correct if it is a 2001 or 2002 model year according to the Mercury Cougar Owner Guides ( 1996 , 1997 , 1999 , 2000 guides show 5W-30 from the factory )
hold the select and the units buttons at the same time for 5 to 10 seconds
Not just can, but should. Ford recomends full synthetic for both the V6 Duratec and the I4 Zetec.
near the oil filter