How does the specific heat of transformer oil affect cooling?

Specific heat describes how much energy the oil can absorb per degree of temperature rise. Higher specific heat allows the oil to carry more heat away from windings and core for the same temperature increase, which improves thermal stability during load swings. In practice, cooling performance depends on a combination of properties: specific heat, thermal conductivity, viscosity (affecting flow), and the cooling design (radiators, pumps, fans, oil ducts). Oils with better heat capacity and flow characteristics help reduce hot spot temperatures, extending insulation life and increasing safe loading margin.