What is a potential result of a high crankcase oil level?

A high crankcase oil level can lead to several issues within an engine, which is why the chosen answer encompasses multiple potential problems.

When oil levels rise too high in the crankcase, it can create lube oil aeration. This occurs because the crankshaft can churn the excess oil, causing it to froth and foam. Aerated oil loses its ability to lubricate effectively, which might lead to increased wear on engine components.

Moreover, a high oil level can cause fluctuations in the oil pressure gauge. This is due to the excess oil potentially disrupting the normal flow and return of the oil within the lubrication system, causing erratic readings and making it difficult to accurately assess the engine's lubrication status.

Lastly, excessive oil can contribute to damage to friction bearings. When oil is aerated, it no longer provides a consistent lubricating film, which can lead to metal-to-metal contact in the bearings. This contact generates heat and can cause premature wear or even catastrophic failure of these critical components.

Overall, the correct answer highlights the interconnected nature of these issues, all of which can stem from a high crankcase oil level.