I recently used STP in my 84 MB and it worked fine.
In the Power Steering pump
soap
Automatic Transmission fluid
Use any fluid for use in power steering systems that is labeled Power Steering Fluid.1984-2001 Cherokee Owners Manuals and Factory Service Manuals both state in bold letters DO NOT USE ANY ATF IN THE POWER STEERING.
Between the water pump and firewall on passenger side
just remove cap, check level and add directly to reservoir the specified type fluid.
To adjust the power steering belt on your 1984 Mercedes 280SL, first, locate the power steering pump and the belt tensioner. Loosen the bolts securing the power steering pump bracket, then adjust the pump to increase tension on the belt. Ensure the belt has about 1/2 inch of play when pressed in the middle, then tighten the bolts back to secure the pump in place. Finally, check that the belt is aligned properly and secure before starting the engine.
The washer fluid reservoir in the middle under the hood slides forward and out. Once you've pulled it off its tray, move it to the side and you'll be able to see the power steering reservoir below where the washer fluid was.
It actually uses ATF in the power steering system. I believe Dextron IID was the spec for '84, but fortunately the newer Dexron formulations are backwards compatible.
To remove the steering wheel on a 1984 Mercedes 300 you first need to remove the Mercedes logo in the center of the wheel to access the bolt holding the wheel in place. A 10mm allen socket with a 6-inch extension is needed to remove the bolt.
how do ower steering brackets go on 1984 elcamino
Dexron III