What are the symptoms indicating an oil change is needed?

[VanAubrey]

When the engine oil is insufficient, the engine components will rub against each other, leading to damage over time. Without the cooling function, phenomena such as burning the crankshaft or bearing shells may occur during high-speed engine operation. It is recommended to replenish the oil as soon as possible when it is low. Below is more relevant information: 1. The role of engine oil: Engine oil, often referred to as the 'blood' of a car, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. 2. How to add engine oil: When adding oil, it is generally advisable to keep the oil level at the midpoint of the dipstick's marked range. Ensure the car is parked on a safe and level surface, as measuring on an incline will yield inaccurate readings. Do not overfill beyond the upper limit, as this can increase resistance on the crankshaft, leading to additional friction losses. Moreover, it can raise the crankcase pressure, increase oil consumption, and impair engine combustion.