Oil coolers usually use water to cool the oil to keep the oil temperature within the permitted temperature.
Common materials for heat transfer tubes: T2 / Hsn70-1 / H68A / BFe10-1-1 / BFe30-1-1 / TP304 / TP316L / TP317L / TA1 / TA2, etc.
Heat transfer tube form: smooth tube / low fin tube / swirl tube, etc.
Common equipment: main engine lubricating oil cooler, small machine lubricating oil cooler, working oil cooler, lubricating oil cooler, thrust bearing oil cooler, etc.