Can engine oil be filled to the upper limit?

[JocelynRose]

Engine oil can be filled to the upper limit, but it must not exceed the max mark on the dipstick. Engine oil, also known as engine lubricant, serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, as well as shock absorption and cushioning. Inside the engine, there are many metal surfaces that rub against each other during operation. These components move at high speeds under harsh conditions, with operating temperatures reaching 400°C to 600°C. Engine oil helps reduce wear on engine parts, thereby extending their service life. Automotive engine oils are categorized into three types: mineral oil (derived from crude base oil), semi-synthetic oil (a blend of conventional oil and synthetic base oil), and fully synthetic oil.