Overfilling the engine with oil can lead to serious mechanical problems. When the oil level exceeds the optimal range, it creates excessive pressure inside the crankcase. This can result in the oil foaming, which reduces its lubricating properties and can lead to increased wear and tear on engine components. Additionally, overfilled oil can be forced into places where it shouldn’t be, such as the combustion chamber, where it can cause spark plug fouling and potentially damage the catalytic converter. Moreover, overfilling can cause seals and gaskets to fail prematurely due to the increased pressure, leading to oil leaks and further complications. Following manufacturer guidelines for oil levels is crucial to ensure proper lubrication, maintain engine efficiency, and avoid costly repairs or even engine failure. Therefore, it’s important to avoid overfilling the engine to ensure optimal performance and longevity of the vehicle’s engine system.