"The power steering fluid reservoir is located at the back of the engine compartment on the passenger’s side of the vehicle, near the engine coolant recovery tank. See “Engine Compartment Overview” in the Index for more information on location." This is right out of the owners manual, it even shows a picture of the cap. It says right on it "POWER STEERING Do Not Overfill Use Only Approved Fluid". But you would also need to look in the manual for the approved fluid. You don't have a manual you say? No Problem. You can download one FREE here: http://www.autousermanual.com/view/buick/regal/
It may well be, but I can't find it. It looks very easy to find in my owners manual, but I can't find it. Yes my manual shoes a picture of the cap, but I can't find it. I've been told its near the firewall, on the left or passenger side of the car, low down, and hard to reach. I was also told I'd loose some skin getting to it. BUT I CAN'T FIND IT. Could someone be more specific please? exactly where? how far down? behind what? and then tell me why the heck you would put it in such an inaccessible spot that no one can see or reach. It's ridiculous. Can someone help please?