What property should lubricating oil in a turbine not possess?

Lubricating oil for turbines is crucial for ensuring efficient operation and longevity of the equipment. One of the key properties that lubricating oil should not possess is the ability to mix with water. This property is undesirable because water contamination in lubrication systems can lead to significant issues such as the formation of emulsions, which can reduce the effectiveness of the lubricant and lead to increased wear and damage of turbine components. Water can also promote oxidation, corrosion, and the growth of microbial life, all of which can compromise the system's integrity and performance.

High viscosity, while it may be of concern under specific operational conditions, is generally avoided in turbine lubrication because it can lead to increased resistance to flow and pumpability issues. Low thermal conductivity is typically not desired because lubricating oils should be able to transfer heat away from critical parts of the turbine efficiently. Resistance to oxidation is an essential characteristic of good turbine lubricating oil as it helps prolong the life of the oil and prevents the formation of harmful sludge and deposits. Therefore, the ability to mix with water stands out as a property that lubricating oil should not possess.