Does adding a little extra engine oil have a big impact?
3 Answers
If the engine oil level is only slightly above the maximum mark, the impact is minimal, but any more can cause adverse effects. Below are the hazards of overfilling engine oil and methods to check the oil level: Hazards of overfilling engine oil: Excessive engine oil increases the engine's operational resistance, leading to sluggish acceleration and higher fuel consumption. In some vehicle models, it can also cause the engine to burn oil. Methods to check the engine oil level: First, ensure the vehicle is stationary and parked on a level surface. Fully pull out the dipstick, wipe the top clean with a clean piece of paper or cloth, then reinsert the dipstick as far as it will go into the engine. Pull it out again and observe the oil level mark. Typically, the oil should be filled close to the upper limit mark.
I accidentally poured in a bit too much engine oil when changing it recently. At first, I didn't notice any issues, but after driving for a few days, I felt the car noise was louder than before, and fuel consumption increased slightly. After taking it to the repair shop for inspection, I learned that overfilled oil increases internal engine pressure, causing the pistons to churn up foam during movement, which reduces lubrication effectiveness. This could potentially lead to oil seal leaks or accelerated bearing wear. The mechanic said this isn't a minor issue - prolonged operation like this would shorten engine lifespan. Fortunately, I promptly removed the excess oil. Now every time I change oil, I carefully measure with the dipstick to ensure the level is between the min and max marks, never cutting corners for convenience.
I often tinker with my car, and adding too much engine oil is no small issue. When the oil level is too high, the internal pressure of the engine increases, making oil seals or gaskets prone to leaks. The crankshaft also agitates the oil, creating foam, which reduces lubrication. For example, after I once overfilled the oil, the engine started making a buzzing noise and lacked power. Upon inspection, I found that the foamed oil couldn't evenly coat the components. To prevent this, I now let the car sit for a while after adding oil and recheck the dipstick, using a funnel to precisely control the amount. Developing this habit helps avoid mechanical damage and minor repair costs.
