Fluorosilicone oil and ordinary silicone oil: performance differentiation in extreme environments Fluorosilicone oil combines the oleophobicity of fluoride and the flexibility of siloxane by introducing fluorocarbon segments into the siloxane skeleton, becoming a "super lubricant" in extreme environments. Its surface energy is extremely low, which can effectively resist the erosion of fuels, solvents, and chemicals, and performs excellently in aerospace engines and automotive fuel systems. In contrast, although ordinary silicone oil (such as dimethyl silicone oil) is low-cost, it is prone to degradation under high temperature, high pressure, or strong corrosive environments. The radiation resistance of fluorosilicone oil is significantly better than that of ordinary silicone oil, and it is irreplaceable in the nuclear industry and aerospace fields. However, the synthesis process of fluorosilicone oil is complex, with costs several times higher than ordinary silicone oil, and some fluorosilicone oils may have long-term environmental impacts due to their poor biodegradability. The decision should be made based on the severity of the application scenario and environmental requirements.