What is the common indicator of an engine oil leak?

The accumulation of oil spots on the ground near the engine is a common and visible indicator of an engine oil leak. When there is a leak, oil will escape from the engine and typically collect on the surface beneath it. This can manifest as dark, slick spots that can be easily noticed during inspections or when the aircraft is parked. Identifying these oil spots is crucial for maintaining the aircraft's safety and reliability, as it may indicate that oil is no longer circulating properly within the engine system, which can lead to serious issues if not addressed.

While excessive smoke from the exhaust, increased engine temperature, and unusual engine noises can all signify other problems within the engine, they are not definitive indicators of an oil leak. In contrast, the visible oil accumulation provides a direct and tangible sign that maintenance is needed to investigate the source of the leak further. Recognizing this early can help prevent more severe damage to the engine or other components of the aircraft.