1987 mercury grand marquis,what type of power steering fluid.

Never brake fluid and nothing else goes in brake master cylinder.

Put power steering fluid or automatic transmission fluid (dextron)

1 quart probably won`t have much of a affect on the transmission as there is about 10-12 quarts in the transmission to start with.the only way to fix it is to do a transmission service and change all the fluid and the fluid in the torque converter it has a drain plug that you will have to find so you can drain it.

Not the trans fluid

Oil only cools,lubes & applies pressure to
the clutch drums & bands

You change trans & power steering fluid
every 3 years or 30,000 miles on ALL Vehicles

Changing trans fluid DOES NOT FIX ANYTHING

You have to have the OD light issue diagnosed

Throw it away

That was used on the assy line, to fill
the hole in the trans case before the fill tube went in

You should be changing your trans and power steering fluid
every 3 years or not more than 30,000 miles ,on all vehicles.

Use the correct fluid and add a bottle of Red Lubgard, made
by International Lubricants. Get at auto parts store

Also put Lubgard Power Steering Additive in P/S
Make sure you get the correct one,not the Honda Version

Transmission Fluid---Dex/Merc

Do not use power steering fluids, found in the parts store, or any product, for any application with a sealer.

NO SEALERS

Use what your vehicle was designed for

You should flush your P/S Fluid every 3 years
That alone will not correct a problem

The sound should indicate low fluid. Your power steering fluid should be red...may look black depending on how old. Your manual will tell you where to fill.

In the dipstick tube.

dextron II or III

Dextron II or Dextron III is Automatic Transmission oil.

there is a leak, power steering fluid does not just go away, it is leaking somewhere, have u been under the car to look?