Generally, using low gears to maintain high RPMs while descending can achieve engine braking, reducing brake usage and enhancing safety. However, it's important to note that this practice can lead to more frequent combustion within the cylinders, increasing fuel consumption. Prolonged high RPM operation can also accelerate wear on engine components, potentially affecting the engine's lifespan and performance.
Additionally, for certain models, particularly new ones with tighter engine parts, the wear at high RPMs may be more pronounced. Therefore, frequently choosing low gears at high RPMs on descents is not recommended; it's better to select appropriate gears and RPMs based on conditions to balance safety and mechanical wear.
Overall, while using low gears at high RPMs on descents benefits engine braking and reduces brake wear, one must be mindful of the fuel consumption and engine wear associated with prolonged high RPMs. In actual driving, it's advisable to flexibly choose the appropriate gear and RPM according to road conditions and vehicle status to ensure a balance between safety and vehicle performance.
