Where is the engine oil added in a car?

[VanEmersyn]

Car engine oil is usually added through the filler cap located on the left side of the engine, which is a yellow round component on the engine's cylinder head. Introduction: Engine oil, also known as engine lubricant, has a density of approximately 0.91×10³ (kg/m³). It serves multiple functions including lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, as well as shock absorption. It is often referred to as the 'blood' of a car. Engine oil consists of two main components: base oil and additives. The base oil is the primary constituent of lubricants, determining their fundamental properties, while additives compensate for and enhance the shortcomings of the base oil, providing additional performance characteristics, making them an essential part of lubricants. Requirements: As a type of machinery, an engine has common requirements for lubricants similar to other machinery, such as appropriate viscosity, certain anti-oxidation, anti-wear, anti-corrosion, and viscosity-temperature properties. However, engines are also a special type of machinery, and their requirements for lubricants have unique aspects.