What is a Oil Coolant Hose for a 1991 Cadillac Deville?

It is the hose that carries your oil to the radiator or away from it, to be cooled. Oil gets very hot, and must cool to maintain efficiency. These are the thinner metal hoses running to your radiator into the sides. If your looking at the car from the front, the oil hoses are on the right. The ones on the left are Transmission Fluid coolant hoses.