How many liters of engine oil should be added to a BMW X4?

[JasperRose]

When replacing the oil filter, the BMW X4 requires 4.5 liters of engine oil, while without replacing the oil filter, it needs 4.0 liters. The normal oil level should be at the midpoint of the engine oil dipstick. The functions of engine oil for the BMW X4's engine are as follows: 1. Sealing and leak prevention: The oil forms a seal between the piston rings and pistons, reducing gas leakage and preventing contaminants from entering. 2. Rust and corrosion prevention: The lubricant adheres to the surface of components, protecting them from contact with water, air, acidic substances, and harmful gases. 3. Shock absorption and cushioning: When the pressure in the engine cylinder rises sharply, suddenly increasing the load on the pistons, piston rings, connecting rods, and crankshaft bearings, the lubricant transmitted through the bearings helps cushion the impact load. 4. Anti-wear: Adding lubricant to friction surfaces reduces the coefficient of friction, thereby decreasing frictional resistance, saving energy consumption, and minimizing wear.