Has the Start–Stop System Outlived Its Usefulness?

The system is designed to save fuel by shutting off your engine when stopped. But experts say the benefits might be outweighed by hidden costs.

What Is the Start–Stop System?

Modern vehicles often come with a Start–Stop system designed to automatically shut off the engine when the car is stationary, like at traffic lights. This reduces idling time, saves fuel, and cuts down on emissions.

How It Works

When the vehicle stops and certain conditions are met, the engine shuts off. It restarts automatically when the driver lifts the brake pedal (in automatic cars) or presses the clutch (in manual ones). A dashboard icon, typically a circled ‘A’, indicates when the system is active.

Fuel Savings: Real or Imagined?

While the system is built to conserve fuel, some experts argue the actual savings are minimal. The engine consumes more fuel during startups than when idling, especially over short stop intervals.

The Strain on Engine Components

Frequent stopping and starting adds stress to several components, particularly the electric starter motor and battery. Repeated use can lead to premature wear, increasing long-term maintenance costs.

Safety Concerns

Critics highlight a delay when the engine restarts, which could affect driving safety. For example, in high-traffic situations, the slight lag might reduce the driver’s ability to react quickly and safely.

The Problem with Lubrication

Each engine stop halts the lubrication cycle. If restarted frequently over short periods, internal engine parts may suffer from inconsistent oil pressure, potentially causing long-term damage.

Can It Be Disabled?

Most vehicles offer a manual override—a dashboard or console button lets drivers turn off the system. However, in many cars, the system reactivates automatically when the car restarts.

Expert Verdict: Time to Move On?

Experts suggest disabling the feature altogether. Many drivers already do so, citing reduced driving comfort and fear of engine wear.