How do 8V oil coolers Work?

[neptunonc at yahoo.com (Neptuno)]

There has been much talk on this list at different
time about buying and instaling external oil coolers
from volvos and sanwdish style oil coolers from GTI's
and so fort, but how do tghis things work? DO they all
work the same? Some seem to be coolant cooling oil and
others seem to be oil coolers getting cooled by a
radiator type cooler. Is that right? ARe there more
than one way to cool the oil?

Here is that sandwish plate one
http://vw-parts.drivewire.com/buynow-vw/water-cool/oil-cooler~pgn1~pcd3478.html

Here is the external version(the one Im most confused
over)
http://www.gprparts.com/brands/gprOilCoolerKit/

TIA
tony

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