What happens if too much engine oil is added to a car?

[VanLillian]

If too much engine oil is added to a car, it will increase fuel consumption. During operation, the crankshaft and connecting rod big end will experience intense agitation, leading to increased internal power loss in the engine. Additionally, more oil will splash onto the cylinder walls, potentially causing oil burning and exhaust issues. Therefore, the oil level should be maintained between the upper and lower marks on the dipstick. Below is some relevant information about engine oil: 1. Since engine oil significantly impacts the performance and lifespan of the engine, it is crucial to strictly follow the vehicle's user manual to select oil of the same series, service grade, and viscosity grade. The oil recommended in the manual is based on the engine's performance and the ambient temperatures of the sales region, providing essential guidance for oil selection while maintaining a considerable safety margin. It is also one of the prerequisites for warranty claims during the engine's warranty period. 2. Choose the viscosity grade according to the engine's technical characteristics. For new engines, oil with lower viscosity should be used to ensure proper running-in during the initial usage period. For older engines with significant wear, oil with higher viscosity is recommended to maintain the required oil pressure and ensure proper lubrication.

[JamesLynn]

I've been driving for over a decade and have encountered many cases of overfilled engine oil. If the oil level is too high, it may cause the oil to foam inside the engine, reducing lubrication effectiveness and increasing friction between internal components. The added resistance can also hinder engine rotation, making the car feel sluggish during acceleration and increasing fuel consumption. Worse still, excess oil can enter the crankcase, pressurizing seals and causing leaks or contaminating other components. Prolonged exposure to this condition can lead to engine overheating or even blue smoke emissions. That's why I always emphasize the importance of checking the dipstick—keeping the oil level between the min and max marks is ideal. If overfilled, stop the car immediately and drain some oil. Don’t neglect regular maintenance, or you’ll end up paying a hefty price for engine repairs.

[GageAnn]

As a father who frequently travels with my family, I'm particularly sensitive to excessive engine oil. It can lead to safety issues, such as unstable oil pressure or sudden engine stalling on the road – how dangerous, especially on highways! When oil foams, lubrication fails, accelerating internal engine wear and increasing the risk of smoking or even fire. I've learned from the community that it's essential to develop a habit: check the dipstick monthly to ensure the oil level is at the midpoint. If overfilled, don't drive immediately—head to a service center first. Maintaining your car is protecting your family's safety; a free check is far cheaper than engine repairs. Never be careless—safety first is what truly matters.

[OscarFitz]

When I first bought a car, I also made the mistake of overfilling the engine oil. That time, I changed the oil myself and accidentally poured too much. As a result, the engine noise became louder, fuel consumption increased noticeably, and the car even emitted blue smoke, which scared me into stopping immediately. A mechanic checked it and said the foam disrupted lubrication, causing pressure in the crankcase and oil leaks. I spent a few hundred bucks fixing the seals. Since then, I've learned to use the dipstick to check and control the oil level properly. New drivers should pay attention to details to avoid similar issues. Simple maintenance can save you a lot of trouble.