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10w30 says it right on the oil cap.
4 quarts
Your "operators manuel" should explain which type of oil to use. I have a 96 Buick, LaSabre, that uses 10/30 wt.
it should be in a bag on the back seat.... If not check at your local parts store
3387A
10W30 and always make sure it has the round "For gasoline engines" seal on the front.
I Use Chicken Oil!
10 30
around 5
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.
If your car has 100.000 miles on the engine,it's best to use 50 weight racing oil. My 90 lesabre has 293000 miles I use 10w30. Thicker oil will not flow to the bearings as quick and is not recommended by GM.