Does coasting in neutral harm a dual-clutch transmission?

[MacBrandon]

Coasting in neutral is dangerous and wastes fuel, and it may even damage the transmission in automatic vehicles. When shifting into neutral (N) while driving normally, the transmission output shaft rotates at high speed while the engine idles, leading to insufficient lubrication from the transmission oil pump. This worsens lubrication conditions and affects the multi-plate clutches inside the transmission. Although power is cut off, the driven plates continue spinning at high speed due to wheel movement, increasing the risk of slippage—a highly hazardous situation. Additional considerations for coasting in neutral: 1. Reduced Safety: Coasting in neutral significantly compromises safety. Vehicle propulsion relies on engine torque, which is weaker in higher gears, resulting in sluggish throttle response and slower acceleration. For proper overtaking, downshifting is recommended. In automatic transmissions, fully depressing the throttle prompts the transmission to downshift, delivering adequate torque. 2. Increased Fuel Consumption: Coasting in neutral does not save fuel and may even increase consumption due to the operation of fuel-injected engines. These engines adjust fuel injection based on programmed parameters. In gear, releasing the throttle activates a coasting mode where the engine stops injecting fuel for extended periods. In neutral, however, the engine enters idle mode and continues injecting fuel.

[VanVivienne]

I've been driving for many years and found that coasting in neutral with a dual-clutch transmission can indeed cause potential damage to the car. When in neutral, the engine and transmission are disconnected, and the oil pump may stop working, leading to insufficient lubrication of transmission components. Like me, driving frequently in the city, after coasting downhill once, I noticed gear shifting felt rough, and upon inspection, the clutch plate showed increased wear. Long-term practice like this can reduce the transmission's lifespan, and repairs can be quite expensive. More critically, there's a safety risk—without the engine helping to control speed during braking, it's easier to lose control. Now, I've gotten into the habit of coasting in gear, which also allows me to use engine braking to save some fuel and protect the car more securely. I recommend that car owners develop good habits, avoid neutral operations, and regularly check the transmission oil level.

[HavenLynn]

I've seen quite a few dual-clutch vehicles, and coasting in neutral is usually not a good idea. Engine stalling can slow down the flow of lubricating oil in the transmission, and the clutch plates experience more intense friction due to lack of pressure, which can easily lead to overheating and accelerated wear. Driving like this long-term can increase shift jerks and may even cause premature damage to internal components. Such issues are commonly seen during repairs, and the costs can be hefty. Although modern vehicles have safety mechanisms, they can't completely prevent damage. Coasting in gear keeps the oil pump working continuously, ensuring proper lubrication and greater safety and reliability. In short, for the sake of your car's health, developing proper driving habits is far more worthwhile than chasing minor fuel savings.

[LaDaniela]

When I first bought my dual-clutch car, I consulted an expert and learned that coasting in neutral can be quite harmful. It can cause the transmission to lack lubrication, accelerate component wear, and even pose safety risks, such as potential brake booster failure. A friend's car malfunctioned after just one instance of coasting, costing a fortune to repair. Now, I avoid using neutral altogether and simply keep the car in gear. A simple habit change can go a long way in protecting your beloved vehicle.