No, synthetic will be fine. Use Quantum Gold from VW.
The chances are the strainer on the pick up is blocked.
It simply unbolt separate from the pump, or you can unbolt the pump as well.
Probably worth changing the whole assembly if you take the sump off.
Then put some cheap oil in and flusher , and change the oil when all is done.
I see Clubgti actually got it right for once!