My Dodge Magnum has one of these oil "cooler" things. It apparently does not have a bypass thermostat, either, at least as far as I can tell from examining the pictures of one. Also, the factory service manual only says this:
Quote:
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Engine oil travels from the oil cooler and into the oil filter. Engine oil then exits the filter into the main gallery. Engine coolant flows into the cooler from the heater return tube and exits into the water inlet tube.
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I might have to get another one from eBay or somewhere to examine, and to possibly install in one of my other vehicles.