Typically, 1.8 liters of water is 3.6 pounds, but gasoline has a slightly lower density than water. Therefore, the same volume of gasoline would weigh a bit less, with 1.8 liters of gasoline weighing approximately 3.45 pounds. The weight of engine oil may vary slightly between different brands. Engine oil, also known as engine lubricant (English name: Engine oil), serves multiple functions such as lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, and shock absorption. Main functions of engine oil: Lubrication: There is rapid relative sliding between pistons and cylinders, as well as between main shafts and bearing shells. To prevent excessive wear, an oil film must be established between the sliding surfaces. A sufficiently thick oil film separates the sliding parts, thereby reducing wear. Auxiliary Cooling: Engine oil has a relatively low specific heat capacity and does not inherently cool the engine. However, during engine operation, the oil absorbs heat generated by fuel combustion and carries it back to the oil tank, where it dissipates into the air, aiding the radiator in cooling the engine. The actual cooling is performed by the water (or antifreeze liquid) outside the engine casing. Cleaning: High-quality engine oil can carry away carbon deposits, sludge, and metal wear particles from engine components through circulation, effectively cleaning the working surfaces of these parts. Sealing and Leak Prevention: Engine oil forms a seal between piston rings and pistons, reducing gas leakage and preventing contaminants from entering. Rust and Corrosion Protection: Lubricating oil adheres to component surfaces, protecting them from contact with water, air, acidic substances, and harmful gases.
