Where does someone add Transmission fluid in a 1998 Buick LeSabre?

The transmission fluid dipstick for a 1998 Buick LeSabre is located on the passenger side of the engine bay. It's usually a long, thin dipstick with markings for "ADD" and "FULL". It might be near the firewall, but it's not deeply buried. Look carefully; it's often near other dipsticks (engine oil, power steering) or fluid reservoirs.

Important Note: Many automatic transmissions in that era are sealed and don't have a dipstick for checking or adding fluid. It is a much more involved process to check or service the transmission fluid if it does not have a dipstick. If you cannot locate a dipstick, it's best to consult your owner's manual or take your car to a qualified mechanic for transmission fluid service.