Like Jim stated, all 2.1L had oil cooler, now, half of the van i see (2.1L)
don't have this one or it's as been condemn/disconnected. Why, i think i
know, the 2 small metal coolant line that feed this one were VERY expensive
at VW, so i guess when they rusted out, som PO never replace those. It's
good to put it back if the coolant tube are present. There is a replacement
O-ring from VW to fix the O-ring... problem.

Cheers