always look in your owners manual. but I've driven and maintained a 90 91 93 Buick century. if 6 cylinder i would suggest 4.4 litres or oil and change the oil filter at every oil change.
The oil capacity for a 1991 Buick Century 3.3 is approximately 5 quarts. The recommended oil type is 10 W 30.
The Buick needs 5qts of SAE 5W-30.
SHOULD BE 5 QUATS
4.5 quarts of 5W-30
If it has a four cyl engine it takes 4 qts of oil, if its a v6 it takes 4.5 qts of oil.
The oil capacity for an oil and filter change is 4.5qts. If you choose to not change the filter it would only be 4.0qts of oil. qts=quarts.
The oil capacity is 4.56 quarts.
where is the oil plug on my 1990 park avnue
The 1989 Buick Century oil sender is located inside of the oil pan. You will need to remove the oil pan in order to view the oil sender.