Should You Turn Off the Engine When Entering a Service Area on the Highway?

[LaJuliana]

When entering a service area on the highway, you don't need to turn off the engine if it's just a brief stop. However, if the stop exceeds 10 minutes, it's necessary to turn off the engine. The hazards of prolonged idling without turning off the engine include: 1. Affecting engine lifespan: When the vehicle remains idling for an extended period, the engine continuously operates at low RPM, making it more prone to carbon buildup on pistons and valves. This can lead to unstable idling and other adverse effects on engine performance, even impacting the engine's service life. 2. Clogging of the catalytic converter: Since the air-fuel mixture is mostly in an enriched state, if the fuel quality is slightly poor, it can accelerate the clogging of the catalytic converter compared to driving conditions.

[McKennedy]

I've been driving on highways for over a decade, and whether to turn off the engine at rest stops depends on the situation. If you're just stepping out for a quick smoke or some fresh air and will be back in three to five minutes, there's really no need to turn off the engine—frequent starts actually increase engine wear. However, if you're stopping to eat, use the restroom, or rest for more than half an hour, keeping the engine running wastes fuel, increases carbon buildup, and might even violate local environmental regulations. My habit is to turn off the engine and lock the car if I'm stopping for more than 10 minutes, giving the engine a break to prevent overheating. Safety is more important—always remember to engage the parking brake and shift into P mode before leaving the car to prevent any unintended movement.

[Logan]

I think it's best to develop the habit of turning off the engine when stopping at service areas. Idling consumes over one liter of gasoline per hour, and this expense adds up significantly over time. During my last maintenance, the mechanic mentioned that prolonged idling slows down the oil pump, leading to insufficient lubrication of the bearing shells, which can easily cause cylinder scuffing. Moreover, continuous low-speed engine operation actually causes more wear to components than the momentary start-up. Of course, if it's the peak of summer with elderly or children in the car, running the air conditioning while waiting for a few minutes is understandable. In short, estimate the time yourself: it's fine for a quick water bottle purchase, but if it exceeds five minutes, you should turn off the engine. From an environmental perspective, this also makes sense, as it can reduce exhaust emissions by 30%.

[McDamian]

It depends on the vehicle model. I drive a hybrid, so I don't worry about this issue. For traditional fuel-powered vehicles, you must turn off the engine if parked at a service area for more than two or three minutes. Idling consumes more fuel, is less environmentally friendly, and can easily cause localized overheating of the engine. Actual tests have shown that the fuel consumption of starting the same car once is only equivalent to idling for a little over ten seconds, so frequent engine shutdowns and starts won't harm the car. Safety reminder: Remember to turn on the hazard lights after shutting off the engine, especially at night, to alert vehicles behind you. Additionally, service area terrain is often uneven, so always firmly engage the parking brake and put the car in park.

[MaryLynn]

As someone who frequently drives long distances, I always turn off the engine when stopping at rest areas. First, it saves fuel—idling for three hours is equivalent to wasting a 100-kilometer drive. Second, it reduces carbon buildup; prolonged low-speed operation leads to incomplete fuel combustion, blackening the exhaust pipe. Third, and most crucially, it's safer: last year, there was news of a driver who didn’t turn off the engine while stepping out to buy something, resulting in the car rolling downhill and hitting someone. Although modern cars have anti-rollback protection, it’s better to be safe than sorry. If it’s really hot, turning off the engine and opening the windows for ventilation is much healthier than running the AC nonstop.

[VonKai]

Observing the practices of many experienced drivers, they generally decide based on the duration of the stop. Personally, I insist on turning off the engine for three major reasons: saving money is a hard truth—idling can burn an extra two tanks of fuel a year; protecting the engine's lifespan, as continuous low-load operation accelerates wear; and promoting safe driving awareness—leaving the engine running when exiting the vehicle is considered a violation and can result in penalty points. Technically speaking, modern car starting components are very durable, so there's no need to worry about damaging the vehicle. However, there is one exception—in extremely cold regions with sub-zero temperatures, it's acceptable to keep the engine idling briefly to maintain warmth. Under normal temperatures, if the stop exceeds 5 minutes, it's best to turn off the engine.