You can use synthetic fluid in any car, just be sure to get all the old brake fluid out before you add the synthetic.
Yes. Normal brake fluid is actually synthetic
If the synthetic fluid is silicone based, yes. If it is a dot 3or 4 type, no.
Non-synthetic brake fluid.
You add fluid at the same place you check the level.
DOT ( 3 ) brake fluid
If it is automatic transmission you can use any brand of tranny fluid as long as it is AF fluid. If it is a manual transmission then use dot 3 brake fluid unless you can find clutch fluid, both work the same.
yes
yes,,,, all brake fluid is synthetic. EXCEPT Dot 5 which you CANNOT mix only because it is silicone based.
At or near the power steering pump.
yes
All Mercedes model cars should only use synthetic DOT4 brake fluid
One at each Wheel just below where the Brake fluid line attaches. One or two at the Brake fluid reservoir.