Generally, there are two kind thermal oil said Synthetic oil and mineral oil.
1. Synthetic oil is more energy-saving and has a long service life (generally there is no problem for more than 8 years, can be recycled and used, mineral oil has a high viscosity, is not energy-saving, and has a short service life (usually about 3 years). The oil needs to be cleaned later, and the cleaning cost is not cheap.
2. In the market, synthetic oil is expensive than mineral oil.