What is the normal color of car engine oil?

[Nadia]

Car engine oil is normally light yellow in color. The functions of engine oil are: 1. To separate the surfaces of relatively sliding parts, thereby reducing wear; 2. To bring heat back to the oil tank and then dissipate it into the air to help the radiator cool the engine; 3. To circulate carbon deposits, sludge, and worn metal particles from engine parts back to the oil tank, flushing away dirt generated on the working surfaces of parts through the flow of the lubricating oil. The method for changing engine oil is: 1. Use a jack to lift the vehicle, locate the drain plug and unscrew it to drain the oil; 2. After unscrewing the oil filter, place a container beneath it; 3. Replace with a new oil filter and add new engine oil.