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The 2000 Buick LeSabre featured a standard 3.8 L V6 engine with no alternative engine choices for any trim level. This engine requires synthetic 10W-30 motor oil, though 5W-30 can be used in warmer climates as an alternative. However, 10W-30 is the recommended oil type. The oil capacity is 4.5 US quarts, which means a full refill will require a 1.25 gallon jug. To remove the oil drain plug, a 15mm socket is needed, and it should be tightened to 25 ft-lbs of torque.
The recommended oil for a 2000 Buick LeSabre is 5w-30.