Engine oil capacity is the recommended amount of oil an engine should have, according to HowStuffWorks. Overfilling the engine with oil can lead to oil spreading to other parts of the car. An engine without enough oil is prone to overheating due to a lack of lubrication.
Oil provides many benefits to car functions when used correctly, as stated by HowStuffWorks. A vehicle must have the correct amount of oil based on its capacity, which differs depending on the year, make and model. This information may not be necessary for consumers who use mechanics for oil services, but it is essential to those who change their vehicles' oil manually.