How much engine oil should be added during maintenance?
2 Answers
During maintenance, the amount of engine oil should be between the upper and lower limit points, and should not exceed the upper limit point. When the oil in the engine oil pan is insufficient, the friction between bearings and journals and other components will cause poor lubrication due to insufficient oil, which will aggravate the wear of various engine components. If there is too much oil, it will not only increase the power loss inside the engine, but also cause more oil to splash onto the cylinder wall, leading to oil burning and exhaust faults. Engine oil is a substance enhanced with additives in base oil, mainly containing anti-wear additives, detergents, dispersants, and multi-grade oil viscosity index improvers.
Every time I go for maintenance, I first check the vehicle manual, which clearly states the oil capacity. For example, my sedan requires 4.5 liters. This is something you really can't estimate by feeling. Last time I went for maintenance, the technician reminded me that there are slight differences in oil requirements between seasons. Most importantly, after adding oil, you must check the dipstick. It's best to check when the engine is cold, with the oil level ideally in the middle of the scale marks. Adding too much oil can cause excessive crankcase pressure and lead to oil seal leaks, while adding too little can result in insufficient lubrication and cylinder scoring. I remember last year my friend's car had 1 liter too much oil, causing the engine to emit blue smoke directly, and the repair cost nearly ten thousand yuan.
