Can I Leave My Car in the Garage for 3 Months Without Running It? UNVERIFIED
Learn about the implications of leaving your car unused for an extended period.
There's no confirmed answer to this yet. Below is what is and isn't known — we'd rather be honest than invent a number or a spec. This becomes a full guide the moment we can confirm it; for now, your owner's manual is the authority on your specific car.
Potential Issues with Leaving a Car Unused
Leaving your car in the garage for three months without running it can lead to several issues. One of the most common problems is battery drainage. Car batteries can lose their charge if not used regularly, which may prevent your vehicle from starting when you return.
Another concern is the fuel in the tank. If your gas cap is indeed lost, fuel can evaporate or become contaminated, leading to potential issues when you try to start the car again. Additionally, tires can develop flat spots from sitting in one position for too long, and fluids may settle or degrade over time.
Best Practices for Long-Term Storage
If you plan to leave your car unused for an extended period, consider taking some precautions. First, if possible, replace the lost gas cap to prevent fuel evaporation and contamination. It’s also advisable to fill the tank to reduce the amount of air in the tank, which can help minimize condensation.
Consider using a battery maintainer to keep the battery charged. Inflate the tires to the recommended pressure to avoid flat spots, and check fluid levels before leaving the car. Lastly, if you can, start the car every couple of weeks and let it run for a short period to keep the engine and other components lubricated.
EPA/DOE FuelEconomy.gov data retrieved 2026-10-25.