Parkerizing.... phosphate coating... ~ same thing.... makes the parts parkerized more resistant to wear and corrosion... many GI weapons were parkerized During the wars...
Do I need to coat it with something like rem oil to protect from moisture or no?
Use oil or other corrosion protection since you will get wear and scratches and moisture making its way in to the ferrous base steel. Doesn't need to be much, just a light coating / wipe down after use.
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Clean as normal. I prefer using CLP on them light coat If you ever re-coat it it must be 100% clean and free of any oil.