Does Engine Oil Decrease Over Time?

[VonMakayla]

Engine oil does decrease over time. Here are the specific reasons why engine oil decreases with use: 1. Combustion Consumption: The piston, piston rings, and cylinder liner have the function of sealing high-temperature combustion gases and transmitting engine combustion power, so they must be well lubricated. The crankshaft splashes oil to various parts of the engine, and the piston rings scrape off the oil adhering to the cylinder liner each time they move downward. However, some oil still remains on the cylinder liner and participates in combustion inside the cylinder, leading to consumption. This is the primary reason for engine oil consumption. 2. Power Stroke: To enhance lubrication between the cylinder liner and piston and reduce wear, the engine has patterns on the cylinder wall surface designed to store oil. These patterns can hold more oil, resulting in higher oil consumption during each power stroke.