Jeppesen Powerplant Orals Practice Test 2025 – Complete Prep Guide

Using the wrong oil viscosity in an aircraft engine can lead to an increased risk of overheating. Oil viscosity refers to the thickness or resistance to flow of the engine oil. If the viscosity is too low, the oil may not provide adequate lubrication, particularly under high temperatures or extreme operational conditions. This can cause the engine components to experience excessive wear and friction, which generates more heat.

Conversely, if the viscosity is too high, the oil may not circulate effectively, leading to inadequate lubrication during engine operation, further exacerbating overheating issues. Proper oil viscosity ensures efficient lubrication of engine components, reduces friction, and helps maintain optimal operating temperatures. Therefore, using the recommended oil viscosity is crucial for preventing overheating and ensuring the safe and reliable operation of the aircraft engine.