Problems with a VW 16V

[pfcs]

Get rid of the oil radiator and put in the original oil/water inter-cooler sandwich @the oil filter hsg-I promise it works better than the heavier/more vulnerable oil radiator.
Get the factory windage-tray/oilpan gasket setup.
Factory oilpump (not Brazilian, Chinese, or any other aftermarket mfg; a good used factory pump is OK 2nd choice)
Absolutely get a ~30psi warning sender and a light you can't miss.
Keep the oil just to the upper mark of the stick but never overfilled.
Run the factory/steel 5qt pan.
Run good synthetic (ie: Mobil 1) oil 10w-30
Run std brg clearances.
People will tell you alu pans, trap door pickups. accusumps, etc ad nauseum, but these readily available parts work 100% in IT.
And you should have an oil press gague w/rapid response (i.e: mechanical/AN3 lines) in your field of vision.