Which one is preferred for aircraft engine ?
Correct answer: C. High viscosity index lube oil
- A. High freezing point aviation fuel
- B. Low viscosity index lube oil
- C. High viscosity index lube oil
- D. None of these
Explanation
Aircraft engines operate over a wide temperature range, so the lubricant must maintain nearly constant viscosity and remain effective at both low and high temperatures. A high viscosity index indicates less change in viscosity with temperature.
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