Overfilled oil in an engine can cause several symptoms that indicate a problem. Common signs include excessive engine smoke, often blue or gray, due to burning oil being forced past seals or gaskets. You might also notice a rough or unstable idle as the engine struggles with too much oil. Additionally, an overfilled oil level can lead to foamy oil, which diminishes lubrication efficiency and can cause knocking or unusual noises from the engine. Another symptom is an increase in exhaust emissions and a noticeable decrease in fuel efficiency. If you suspect your engine has too much oil, it’s crucial to address it promptly to avoid potential damage to engine components and ensure smooth operation.

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