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What Are the Hazards of Coasting in Neutral with an Automatic Transmission?

2 Answers

HarleyAnn

09/08/25 2:13am

The hazards of coasting in neutral with an automatic transmission include: coasting in neutral does not necessarily save fuel and may instead consume more; it can cause the vehicle to skid; it may damage the automatic transmission; and it is not conducive to engine braking, potentially leading to rough gear shifts. L Gear: Low gear, which limits speed. When engaged during uphill driving, it maintains a state of high RPM and low gear. S Gear: Sport mode, where the transmission can shift freely but the shifting timing is delayed, keeping the engine at high RPM for an extended period, allowing the car to move at low gear and high RPM for a longer time. D Gear: Drive gear, used for forward movement of the car. N Gear: Neutral gear, used for brief stops. P Gear: Parking gear, which must be engaged when parking to stop the car's braking and prevent rolling. R Gear: Reverse gear, used when reversing. However, R gear should only be engaged when the vehicle is completely stopped. Engaging R gear while the car is moving slowly can cause severe damage to the transmission.

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LaPhoebe

09/19/25 7:55am

As a veteran driver with 15 years of automatic transmission experience, I strongly oppose coasting in neutral. The transmission oil pump can only maintain minimal lubrication in neutral, and after just a few hundred meters, the gear set may experience dry friction and overheating. Components like the clutch plates in AT transmissions could be completely ruined. It's even more dangerous when going downhill - last year while driving on mountain roads, I witnessed a car coasting in neutral whose brakes overheated and failed. The desperate driver frantically yanked the gear lever but couldn't engage Drive. With transmission repairs now costing tens of thousands, the minimal fuel savings aren't worth it. There's good reason why manufacturer manuals explicitly prohibit coasting in neutral.

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