Luddite, the heat exchanger is actually a small oil cooler using water cooling as opposed to the more traditional oil to air coolers.

I guess it would also help to get the oil up to temperature a bit quicker although how efficient it is as an oil cooler I don't know as the oil is being cooled by 90 (ish) degree water.

Here's a photo showing the heat exchanger sandwiched between the block and the oil filter with water hoses in and out.


[Linked Image]

Bob

2009 Black Roadster
1999 4/4 2 litre Zetec