Whether you’re storing a classic car, a seasonal vehicle, or simply leaving your car unused for several months, knowing how to store a car long-term without damage is essential. Poor storage can lead to flat batteries, seized brakes, fuel problems, mould, tyre damage, and even corrosion.
This guide explains exactly how to prepare your car for long-term storage, what to avoid, and how to ensure it’s ready to drive again when you need it.
What Counts as Long-Term Car Storage?
Long-term storage usually means leaving a car unused for more than 30 days, but issues become more likely after 2–3 months without driving.
Common reasons include:
- Seasonal vehicles (convertibles, campers)
- Temporary relocation or travel
- Project cars or restorations
- Classic or collector vehicles
Choose the Right Storage Location
Where you store your car has a major impact on its condition.
Best options:
- Garage (ideal) – dry, secure, temperature-stable
- Car barn or storage unit – good ventilation is key
- Driveway (last resort) – requires extra protection
Avoid areas with:
- Damp or flooding risk
- Tree sap or falling debris
- Large temperature swings
Expert insight:
“Moisture is the biggest enemy of stored vehicles. A dry, well-ventilated space prevents corrosion and electrical issues.”
— The AA Technical Advice Team
Clean the Car Thoroughly (Inside and Out)
Cleaning isn’t just cosmetic — it prevents long-term damage.
Exterior:
- Wash and dry the car completely
- Apply a coat of wax for paint protection
- Clean wheels and brake components
Interior:
- Vacuum carpets and seats
- Remove food and rubbish
- Wipe hard surfaces to prevent mould
Even small dirt particles can damage paint or attract moisture over time.
Change the Engine Oil and Filter
Old engine oil contains contaminants that can cause internal corrosion during storage.
Before storing:
- Change engine oil
- Replace the oil filter
Fresh oil protects engine components while the car sits unused.
Expert insight:
“Clean oil is one of the simplest ways to protect an engine during long periods of inactivity.”
— RAC Vehicle Maintenance Specialists
Protect the Battery
Car batteries slowly discharge when not in use.
Best options:
- Disconnect the battery (negative terminal)
- Use a battery maintainer or trickle charger
- Store the battery indoors in extreme cold
A flat battery is one of the most common storage-related issues.
Prevent Tyre Damage and Flat Spots
Tyres can develop flat spots if left stationary for long periods.
To protect tyres:
- Inflate tyres to the upper recommended pressure
- Move the car slightly every few weeks (if possible)
- Use tyre cradles or stands for long storage
For storage over 6 months, lifting the car on axle stands is ideal.
Fill the Fuel Tank and Use Fuel Stabiliser
Leaving a tank partially empty can cause condensation and fuel degradation.
Fuel storage tips:
- Fill the tank completely
- Add a fuel stabiliser (especially for petrol)
- Run the engine briefly to circulate treated fuel
Diesel vehicles benefit from anti-bacterial additives to prevent fuel contamination.
Release or Protect the Handbrake
Leaving the handbrake engaged for months can cause it to seize.
Instead:
- Leave the handbrake off
- Use wheel chocks to prevent rolling
- For automatics, leave the car in “Park”
This is especially important in damp environments.
Seal and Protect Against Moisture and Pests
Rodents and moisture cause surprising amounts of damage.
Prevent issues by:
- Using moisture absorbers inside the cabin
- Blocking exhaust tips with breathable covers
- Avoiding airtight plastic tarps
If using a cover, choose a breathable car cover designed for long-term storage.
Check Coolant, Brake Fluid, and Other Fluids
Ensure all fluids are at the correct level:
- Coolant
- Brake fluid
- Power steering fluid
- Washer fluid
Coolant protects against corrosion as well as freezing.
Don’t Start the Car Too Often
Starting the engine briefly without driving can actually do more harm than good.
If you start it:
- Drive long enough to reach full operating temperature
- Avoid short idle starts
If driving isn’t possible, leave the car undisturbed and properly prepared instead.
Long-Term Car Storage Checklist
✔ Clean exterior and interior
✔ Change engine oil and filter
✔ Fill fuel tank and add stabiliser
✔ Inflate tyres or use stands
✔ Disconnect battery or use maintainer
✔ Leave handbrake off
✔ Use moisture absorbers
✔ Cover with breathable car cover
How to Bring a Car Out of Long-Term Storage
Before driving again:
- Reconnect and test the battery
- Check tyre pressures
- Inspect brakes for binding
- Check fluid levels
- Look for leaks or warning lights
Drive gently for the first few miles to allow components to re-bed properly.
Frequently Asked Questions
How long can a car sit without being driven?
With proper preparation, a car can sit for 6–12 months or longer without damage.
Should I start my car weekly during storage?
No. Short starts can cause condensation and engine wear unless the car is driven fully.
Is indoor storage better than outdoor storage?
Yes. Indoor storage significantly reduces moisture, corrosion, and UV damage.
Final Thoughts
Learning how to store a car long-term without damage protects your investment and avoids costly repairs when the vehicle returns to the road. With the right preparation, even extended storage can be completely safe.
As experts agree, prevention is far easier — and cheaper — than repair when it comes to long-term car storage.
