Why is there oil in your air filter?

Oil in your air filter can indicate several issues, such as excessive oil blow-by from the engine, a malfunctioning positive crankcase ventilation (PCV) system, or an improperly maintained engine. It may also result from using too much oil during an oil change or from oil leaks in the intake system. This can lead to reduced engine efficiency and increased emissions, so it's important to address the underlying cause promptly. Regular maintenance and inspections can help prevent oil buildup in the air filter.