It originally used Type A but the modern equivalent is Dexron III A/T fluid.
In the power steering fluid tank
bottom left front of motor
I believe that any kind of power steering fluid will work. You can actually use any type of hydraulic fluid (i.e. brake, power steering, or transmission). It is usually best to use only power steering fluid if you can get it.
pictures of where to put power steering fluid in a 1990 buick lesabre
Where is the power steering fluid for a 1997 Buick Regal LS 3.8 liter engine?
At the power steering reservoir.
what type pf power steering fluid take for a 94 buick lesabre
The manual states GM power steering fluid DOT 3
Owner's manual.
you need power steering fluid.
both power steering fluid and transmission fluid are hydraulic fluids, but it would be best to get some power steering fluid. its cheap and its the right stuff. 91 buicks take just plain Jane power steering fluid.
Should be stamped right on the steering fluid reservoir cap. If not any power steering fluid will work.