Does Auto Start-Stop Damage the Engine?

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Auto start-stop does not damage the engine. Engine wear primarily occurs during cold starts, and frequent restarts do not cause significant wear. The engine relies mainly on oil film lubrication, and auto start-stop durations are very short. The oil pumped up by the oil pump does not completely drain back, leaving sufficient lubrication on the components. During a hot restart, the engine's speed and timing are minimally affected. When the vehicle restarts after a brief stop, the engine is already at normal operating temperature, reducing startup resistance. Auto start-stop efficiency also depends on factors like engine displacement, technology used, and the duration of stops (e.g., at traffic lights). Larger displacement engines and longer idle times result in greater fuel savings, with more noticeable fuel efficiency benefits the longer the engine remains off.