The oil capacity for a 1991 Buick Century 3.3 is approximately 5 quarts. The recommended oil type is 10 W 30.
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.
4.5 quarts
what type of engine??
The Buick needs 5qts of SAE 5W-30.
SHOULD BE 5 QUATS
4.5 quarts of 5W-30
4.75 litres
4.5 quarts
5w30 Any premium brand high detergent oil.
should be located on front of engine above the oil filter.
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.