What are the disadvantages of excessive engine oil?
3 Answers
Excessive engine oil can cause the following issues: 1. Increased engine power loss; 2. Oil may enter the combustion chamber; 3. Engine oil burning, resulting in blue smoke from exhaust emissions; 4. Significant increase in oil consumption; 5. Increased carbon deposits inside the engine. Engine oil, also known as motor oil or engine lubricant, is a substance enhanced with additives in base oil, primarily containing anti-wear additives, detergents, dispersants, and multi-grade oil viscosity index improvers. The main functions of engine oil are to reduce friction and wear on moving parts, and to remove sludge and varnish from the engine. It also neutralizes acids produced from fuel and lubricant oxidation (detergents), improves the sealing of piston rings, and cools the engine by carrying away heat from moving parts.
When I worked at an auto repair shop, I often encountered cases of overfilled engine oil, which has quite a few drawbacks. Too much oil increases internal engine pressure, easily damaging oil seals and gaskets, leading to leaks. The crankshaft stirring the oil produces bubbles, and excessive bubbles reduce lubrication effectiveness, accelerating wear on engine components and causing rough power delivery. Over time, this can lead to increased fuel consumption, black or blue smoke emissions, and even engine damage, with repair costs often running into thousands. My advice is to always check the dipstick after an oil change once the engine has cooled down, ensuring the oil level is between the minimum and maximum marks. Regular maintenance can prevent these issues—driving safety is paramount. A little routine care can save you big money and give you peace of mind.
As a car enthusiast, I once tried overfilling the engine oil, which resulted in significant performance degradation. The drawbacks were obvious: foaming of the oil reduced lubrication efficiency, increased resistance to piston movement, and made the car feel sluggish; fuel consumption increased by 10% to 15%, with unstable power output; excessive crankcase pressure led to oil leaks, and in severe cases, engine overheating and damage. The risks are even greater during races or long-distance driving, as insufficient lubrication can cause instant component seizure. On a related note, checking the oil dipstick is simple—I use a measuring rod myself; maintaining the proper oil level can enhance both driving pleasure and fuel economy. Developing good habits allows the car to perform at its full potential.
