I Use Chicken Oil!
The spark plug gap for a 2003 Buick LeSabre should be set at .060 inches. The best spark plug for this vehicle would be an Iridium plug.
gray area, it varies. Usually replaced when they fail....but check your fuel filter first...it's much easier.
I believe it is 3000 lbs... best in class for a mid-size car.
The battery is located under the back seat. You pull up on the front bottom of the seat and then forward. Your battery and several fuse boxes are located there. Removing it is self explanatory after seeing it. This location is not the best for a battery as it usually rotts out the floor pan.
Mobil 1 10W-30 or for colder climates Mobil 1 5W-30
Probably around 16 mpg. I had a 1969 LeSabre once and the best I got out of it was 18.6 on the freeway.
Best answer would be from a GM dealer
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.
MAY I ASSUME YO MEAN SENORS? TO THE BEST OF MY KNOWLEDGE THERE IS NO CENSORSHIP FOR OWNING A BUICK. aARE YOU TALKING ABOUT THE "Oxygen Sensor" (typical one that goes bad).R SONMETHING ELSE?
The battery in your 2002 Buick LeSabre (and probably all LeSabres that share the same body style, 2000-2005) is located under the rear seat. To reach it you simply pop out the rear seat cushion by pushing in at the bottom and lifting. It's a special battery with vents that connect to a vent hose the other end of which goes through the floor pan to the outside. When reinstalling be very sure that the vent hose is in good condition and properly connected to the battery. The hydrogen sulfide fumes fom a lead/acid battery can attack the seat cushion or eat a hole in the floor, not to mention being highly flammable. When I had to replace mine I discovered that not all battery shops carry the proper battery for this vehicle. The best price I could find actually was at a Buick dealership for an OEM battery (which has held up quite well). Do not try to "cheap out" and substitute a "normal" battery. It will end up costing you more and could potentially be very dangerous.
For what purpose? The negative terminal is on the battery located under the rear seat cushion. If you are trying to jump start the vehicle, there is a positive terminal at the back of the fuse box located at the front of the right (passenger's side) inner fender. I have used any good ground (engine bolt, etc.) with this combination for 12-volt power needs under the hood. If you are disconnecting or removing the battery, it's best to use the rear seat location.