The viscosity of engine oil affects the engine’s performance in several ways. First, the thickness of the oil affects how well it can flow through the engine’s narrow passages and lubricate the moving parts. Thicker oil can resist flowing easily, leading to increased friction, wear, and tear.
On the other hand, if the oil is too thin, it may not provide enough lubrication, leading to increased wear on the engine’s moving parts. This can cause damage to the engine over time.