Many industrially manufactured products and their production processes require heat. Direct heat supply is often not possible or has disadvantages. A heat transfer system can help. It works indirectly via heat-transfer oils based on mineral oil or special synthetic liquids. Heat transfer oils are generally in continuous use and must function trouble-free for many years: They have a particularly high temperature resistance. ADDINOL heat-transfer oil XW 15 is based on synthetic base oils and has proven its high performance in practice many times. The product achieves significantly extended oil operating life compared to mineral lubricating oils.