Oil. Most oil brands are good. Depends on your climate, but usually 10w30 or 5w30 should do the job. That's regular oil not synthetic.
Its on the bottom of the oil pan.
The oil pan is bolted to the bottom of the engine
Inside the oil pan, mounted on the engine block.
On a 1991 Mercury Cougar : The oil pump is INSIDE the oil pan ( the oil pan is bolted to the bottom of the engine )
5w20 or 5w30 3 and 1/2 qts.
5 W 30 on a 2.3 Liter.
You may use same oil as the automatic transmission oil. If you don't have any, any auto parts shop will. Dexron.
# 2.3Liter engine takes 5.0L of oil # 3.0Liter engine takes 4.5L of oil
Look under the front of the car. Its on the bottom of the engine.
1w30 in warm weather, 5w30 in cold weather
Should be around the oil filter, check the manual if not there.
10w30 would be a good choice. Any major brand is fine.