While searching on EBay for a Cool Collar, I stumbled across another interesting device. It appears to be an oil/coolant heat exchanger for an Audi or Volkswagen. it's not clear but I'm guessing that it may somehow get sandwiched between the oil filter and mount? For those who were recently considering use of a oil/coolant exchanger, this might have some possibilities? Does anyone have any further knowledge of these?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=46095&item=7951014053&rd=1#ebayphotohosting

Todd