Petroleum based lubricating oils are NOT suitable for use in GTEs for which of the following reasons?

Correct Answer: Option D — They will not withstand the high temperatures generated

Petroleum-based oils lack the thermal stability required for the extreme operating temperatures found in gas turbine bearings and sumps. Synthetic lubricants are specifically engineered to resist oxidation, maintain viscosity at high temperatures, and prevent carbon deposits, ensuring reliable lubrication where mineral oils would rapidly degrade and fail.