* Increased crankcase pressure: Excess oil increases the volume within the crankcase, leading to higher pressure. This pressure can force oil past seals and gaskets, leading to leaks. It can also damage the PCV (Positive Crankcase Ventilation) system, which is responsible for venting crankcase gases.
* Foaming: The crankshaft's churning action can whip up excess oil, creating foam. Foamed oil doesn't lubricate as effectively, leading to increased wear on engine components.
* Oil leaks: The increased pressure can force oil out of seals and gaskets, leading to leaks and potentially oil on the ground or in other critical engine areas.
* Damage to seals: Constant pressure on seals from excess oil can damage them prematurely, leading to eventual leaks.
* Damage to the catalytic converter: Excess oil can be burned and end up coating the catalytic converter. This can reduce its effectiveness and potentially damage it completely.
* Internal damage: In severe cases, foaming and insufficient lubrication can cause damage to internal engine components, such as bearings and connecting rods. This can lead to engine failure.
* False readings: High oil levels can affect the accuracy of the oil level sensor or dipstick, potentially leading to inaccurate oil level readings.
In short, overfilling your engine with oil is never a good idea. It's always better to err on the side of slightly underfilling than overfilling. Always refer to your vehicle's owner's manual for the correct oil capacity.
