[Hocrest]

Use the same DexIII that you use in your tranny. Some parts stores have a fluid that is good for both dex and Merc. Tell them you need some basic DexIIIand they'll hook you up.

A quicker way to drain the system is to remove the low pressure return hose into the pump and run the car till it pumps it dry. The LP is the one with the normal hose clamp, not the metal pipe fitting.