Good stuff, Ben.
Let me just add that the purpose of an engine cooler is to supply cooler oil to the bearing surfaces. Most people may be unaware of the fact that oil is very responsible for transferring heat out of the engine and is just as important as the coolant in the radiator.
In severe conditions an oil cooler can be essential. So if you operate in high temperature areas, high elevation areas, are carrying/towing a big load, an engine oil cooler can substantially increase the expected life span of your engine. Just remember when changing oil that the cooler takes a little bit more to be properly full.
