No problem. It is light hydraulic oil.
Over the years the NAS aka NAFTA T1N Operator Manuals have mentioned Mercedes spec., Synthetic ATFIII, ATF+4, and other power steering fluid substitutes.
Years ago I sucked out the 2004 reservoir and filled with Lucas Power Steering Stop Leak as a preventative measure. Still running. 335,000+ miles on the clock.
Some info is here.
Just wanted to check on "Correct" Power Steering Fluid for our 2003 Dodge Sprinter Passenger Model. Looks like needs topped off. Search found: Mobil ATF-D Local Auto Store Parts shows: Beck/Arnley Power Steering Fluid Lubegard Synthetic Power Steering Fluid Appreciate info/advice. "Thank...
sprinter-source.com
Some will say not to use your old junk. Light hydraulic oil aka fluid is not the same as hydraulic brake fluid. It doesn't deteriorate over time while stored.
If your PS system is leaking you might consider using Lucas Power Steering Stop Leak as I did.
vic