How does oil viscosity work and affect the performance of engines?

Oil viscosity refers to how thick or thin the oil is. Thicker oil has higher viscosity, while thinner oil has lower viscosity. The viscosity of oil affects how well it can lubricate engine parts. Thicker oil can provide better protection at high temperatures and pressures, but it may also make it harder for the engine to start and run smoothly. Thinner oil, on the other hand, may flow more easily at lower temperatures, but it may not provide enough protection at high temperatures. It is important to use the right viscosity of oil for your engine to ensure optimal performance and longevity.