How Long Should a Long-Term Parked Car Be Started

A long-term parked car should ideally be started and run for at least 15-20 minutes every two weeks to keep the battery charged and prevent engine issues. Letting the engine run allows the oil to circulate, maintains lubrication, and prevents moisture buildup in the exhaust system.

For extended storage, consider these steps:

1. Use a battery maintainer or trickle charger to prevent battery drain.
2. Park on a level surface with the handbrake off (use wheel chocks) to avoid brake seizing.
3. Inflate tyres to the recommended pressure to prevent flat spots.

If the car has a modern start-stop system (like in a Ford Focus or Vauxhall Corsa), the battery may drain faster, so more frequent starts (every 10 days) are advisable. Diesel engines may need slightly longer idling (20-25 minutes) to recharge the battery fully.

For electric vehicles (e.g., Nissan Leaf, Tesla Model 3), simply turning on the vehicle periodically isn’t necessary—just ensure the battery charge stays between 50-80% to preserve longevity.

It is advisable to let a car that hasn't been driven for a long time idle for about 10 minutes to warm up. For long-term parking, it's best to start the car once a week, and even better if you can drive it for ten to twenty minutes. The purpose of this is to allow the alternator to charge the battery, preventing battery discharge, while also ensuring various fluids are adequately circulated. This provides better lubrication for the engine and ensures even pressure distribution on the tires, preventing deformation due to prolonged one-sided stress.

Long-term parking can lead to reduced battery capacity, accelerated body corrosion, deterioration of fluids such as engine oil, transmission fluid, and gasoline, tire deformation, brake disc rust, and aging of rubber components.

Engine oil can oxidize, increasing the risk of aging and leaks, while acidic substances may cause severe corrosion to parts. For long-term parking, it's best to drain the oil.

If the engine remains unused for too long, the lubricating oil on the surface of components will drip into the oil pan, leaving parts unprotected and prone to rust. Starting the car once a week and driving it for at least half an hour ensures proper lubrication of engine components, prevents battery discharge, and keeps all engine parts well-lubricated and rust-free.

From a mechanic’s perspective: Start the car every 10-14 days, letting it idle until the engine reaches operating temperature (about 15 minutes). This prevents oil settling, battery drain, and fuel degradation. For diesel engines, extend idling to 20 minutes due to higher compression demands. Check for rodent damage or fluid leaks during each start-up.