What Causes the Oil Can Light to Illuminate in a Car?
2 Answers
Car fault light illumination reasons are as follows: Cooling and temperature reduction: Engine oil can bring heat back to the oil tank and then dissipate it into the air, helping the radiator cool the engine. Cleaning and purification: High-quality engine oil can carry carbon deposits, sludge, and worn metal particles from engine components back to the oil tank through circulation. The flow of the lubricating oil washes away dirt generated on the working surfaces of the components. Sealing and leakage prevention: Engine oil can form a sealing ring between the piston rings and the piston, reducing gas leakage and preventing external contaminants from entering. Rust and corrosion prevention: Lubricating oil can adhere to the surfaces of components, preventing contact with water, air, acidic substances, and harmful gases. Shock absorption and cushioning: When the pressure at the engine cylinder port rises sharply, suddenly increasing the load on the piston, piston skirt, connecting rod, and crankshaft bearings, this load is transmitted and lubricated through the bearings, cushioning the impact load. Lubrication and wear reduction: There is rapid relative sliding between the piston and cylinder, as well as between the main shaft and bearing shells. To prevent excessive wear of components, an oil film needs to be established between the two sliding surfaces. A sufficiently thick oil film separates the surfaces of the relatively sliding components, thereby reducing wear.
That time I went on a long road trip, my heart skipped a beat when the oil can light came on. I discovered there was a significant oil leak due to a small crack at the bottom of the engine. Common causes usually include insufficient oil, an aging oil pump failing to circulate oil, or a faulty sensor giving false alarms. Ignoring it can lead to accelerated engine wear or even total failure. I immediately pulled over, turned off the engine, checked the dipstick, added some oil as a temporary fix, and then drove slowly to the repair shop. The lesson learned: make it a habit to check the oil level with the dipstick every two weeks or before long trips, keeping it at the midpoint; change the oil and filter during maintenance to prevent clogs; don’t wait for the light to act. Remember, this light is critical for engine safety—when it comes on, slow down and pull over instead of pushing through. It saves money and peace of mind.
