Can engine oil still be used after being left in a high-temperature car?
2 Answers
Engine oil cannot be reused after being left in a high-temperature car. Below are the specific functions of engine oil: 1. Shock absorption and cushioning: When the pressure at the engine cylinder port rises sharply, it suddenly increases the load on the piston, piston chips, connecting rod, and crankshaft bearings. This load is transmitted and lubricated through the bearings, providing a cushioning effect against the impact load. 2. Rust and corrosion prevention: Lubricating oil can adhere to the surface of parts, preventing contact with water, air, acidic substances, and harmful gases. 3. 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 on parts, an oil film of sufficient thickness must be established between the two sliding surfaces to separate the relatively sliding surfaces, thereby reducing wear. 4. Cooling: Engine oil can carry heat back to the oil tank and then dissipate it into the air, helping the radiator cool the engine.
It's really not recommended to store engine oil in a car under high-temperature conditions. I've encountered this situation before - leaving an oil container in the trunk for several days during summer when interior temperatures can exceed 40°C. High temperatures cause engine oil to oxidize and deteriorate, reducing viscosity and deactivating additives. Using such compromised oil can lead to increased engine wear, poor lubrication, and even overheating issues. When helping friends with car maintenance at the repair shop, they often ask similar questions, and I always advise checking the oil color - if it turns black or develops an odd smell, don't take chances with it. While immediate problems might not be obvious, prolonged use will damage the engine, potentially leading to expensive repairs. The best practice is to store engine oil in a cool, dry place like a garage corner. Don't take shortcuts for convenience - safety should always come first.
