99% of all gasoline (petrol) powered automobiles have established 5 qt (4.75L) capacity with a new filter. if you do not change the filter it is closer to 4 qts or 3.8L.
3387A
5 Quarts with filter change, 4 without.
4.75 litres
Try coating the area with talcum powder to determine where leak originates
I Use Chicken Oil!
10 30
around 5
4-4.5 quarts. Depending if its a internal oil filter, or external.
The oil filter location for the 2000 Buick LeSabre is on the front of the motor. Look just to the left of the fan belt near the left side of the motor.
Oil level sensor is on side of oil pan.
4.5 quarts with new oil filter
10w30 says it right on the oil cap.