What are the consequences of not changing engine oil for a long time?

[StHarrison]

The consequences of not changing engine oil for a long time are: reduced oil viscosity, severe water-like thinning, and containing a large amount of metal debris and gum deposits, which seriously affect the service life and stable operation of the car engine. High-quality engine oil with appropriate viscosity can effectively seal the gap between the cylinder block and piston, preventing gas leakage. If the engine oil is not changed for a long time, it will become water-like and lose its sealing function. The heat absorption and heat conduction properties of oil are far superior to water. If the engine oil deteriorates severely, it will reduce the cooling function. Engine oil, also known as engine lubricant, plays multiple roles including lubrication and wear reduction, auxiliary cooling, sealing and leakage prevention, rust and corrosion protection, as well as shock absorption for the engine.