AN120A composite additive is resistant to high temperature heat conduction oil, by the high temperature antioxidant, clean dispersant, adhesive agent, anti-rust agent multifunctional additives. Use this product modulation of heat conduction oil has good thermal stability, long service life, less coking, thermal effect is good. This product is suitable for deployment of mainstream temperature not to exceed 320 ° C forced closed cycle system of heat conduction oil