3 Air cooler and oil cooler shall be made of red copper, albata seamless tube or other corrosion prevention tubing.
3空气冷却器和油冷却器应采用紫铜、铜镍合金的无缝管或其他防锈蚀的管材。
英语百科
Oil cooling
Oil cooling is the use of engine oil as a coolant, typically to remove surplus heat from an internal combustion engine. The hot engine transfers heat to the oil which then usually passes through a heat-exchanger, typically a type of radiator known as an oil cooler. The cooled oil flows back into the hot object to cool it continuously.