Engine maintenance refers to the routine servicing and care required to keep an engine running efficiently, reliably, and safely over time. This includes regular oil and filter changes, spark plug replacement, air and fuel filter servicing, coolant system checks, timing component inspections, and monitoring belts and hoses for wear. Proper maintenance ensures optimal combustion, prevents overheating, reduces internal wear, and extends engine lifespan, especially in high-performance or forced-induction vehicles. Neglecting maintenance can lead to reduced performance, higher fuel consumption, and costly mechanical failures, while consistent servicing helps preserve the longevity and value of vehicles such as the Toyota Hilux.