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Transformer oil is a key component in the operation of a transformer. It must have the right combination of volatility and viscosity in order to ensure that the transformer runs properly. Low volatility helps to ensure that the oil does not evaporate, while high viscosity helps to ensure that it does not leak. It is important to use the right combination of these two factors for optimal performance.

The transformer oil should have low volatility and high viscosity to ensure that it remains where it is needed and does not evaporate or leak, thus ensuring a smooth and efficient operation of the transformer.