How to Maintain a Car That Is Not Being Used: Complete Guide to Storing a Standing Car

Estimated reading time: 6 minutes

Cars are designed to be driven. Engines, brakes, electrical systems and fluids all perform best when used regularly. However, there are times when a vehicle must sit unused for weeks or even months. Whether due to travel, illness, seasonal storage or financial reasons, leaving a car standing requires careful planning. Not using a car can be just as damaging as overusing it. Mechanical systems rely on movement. Fluids circulate, seals stay lubricated and batteries remain charged when the vehicle is driven. Without this, deterioration can begin surprisingly quickly.

If your car must stand unused, proper preparation is essential to protect its condition and value.

Why Standing Cars Develop Problems

Before looking at solutions, it is important to understand why inactivity causes issues.

Common problems from leaving a car unused include:

Battery discharge
Flat spots on tyres
Brake corrosion
Oil degradation
Fuel contamination
Moisture build up
Rodent damage

A standing car does not simply pause in time. Mechanical and chemical processes continue, and without preventative measures, damage can occur.

The key principle is preservation.

Clean the Car Thoroughly Before Storage

The first step is always cleaning.

Why Cleaning Matters

Dirt, bird droppings, tree sap and road salt are corrosive. If left on paintwork for extended periods, they can cause permanent damage.

Dust also traps moisture, which increases corrosion risk.

Exterior Preparation

Wash the car thoroughly
Dry it completely
Apply a protective wax layer
Clean wheels and brake components
Remove any tar deposits

Wax creates a protective barrier against moisture and contamination.

Interior Preparation

Vacuum carpets
Remove food and rubbish
Clean upholstery
Leave moisture absorbers inside

A clean interior reduces mould risk and discourages pests.

Store the Car in the Best Possible Location

Where you keep your car makes a major difference.

Ideal Storage Conditions

Dry
Well ventilated
Covered
Away from direct sunlight
Secure

A garage is ideal. If that is not possible, use a high quality breathable car cover.

Avoid cheap plastic covers that trap moisture, as this can accelerate corrosion.

If storing outdoors, choose a location away from trees to reduce sap and debris exposure.

Maintain the Battery Properly

Battery failure is one of the most common issues with standing cars.

Modern vehicles draw small amounts of power continuously for alarm systems and onboard electronics. This parasitic drain can flatten a battery in weeks.

Best Battery Practices

Use a trickle charger or battery maintainer
Disconnect the battery if appropriate
Start and run the vehicle periodically

A smart charger keeps the battery at optimal charge without overcharging.

Simply starting the car briefly is not always enough. If you start the engine, allow it to run for at least 20 to 30 minutes to fully recharge the battery.

Protect the Tyres

Tyres can develop flat spots when left in one position for too long.

Prevent Tyre Damage

Increase tyre pressure slightly before storage
Move the vehicle occasionally
Use tyre cushions or stands for long term storage

Do not overinflate excessively, but slightly higher pressure helps reduce flat spotting.

For long term storage, lifting the vehicle slightly off the ground using proper supports can reduce tyre stress.

Manage Fluids and Engine Health

Engine oil and other fluids degrade over time.

Oil Condition

If storing for several months, consider changing the oil before storage. Used oil contains contaminants that can cause internal corrosion.

Coolant

Ensure coolant levels are correct and the antifreeze concentration is appropriate, especially for winter storage.

Fuel System

Fuel can degrade over time, especially ethanol blended petrol.

For long term storage:

Fill the tank to reduce condensation
Consider adding a fuel stabiliser
Run the engine briefly after adding stabiliser

A full tank reduces internal rust risk.

Protect Brakes From Seizing

Brake discs can rust quickly when stationary.

Light surface rust is normal and usually clears when driving. However, prolonged standing can cause pads to bind.

Avoid leaving the handbrake fully engaged for extended periods if safe to do so. Instead, leave the car in gear and use wheel chocks where appropriate.

If starting periodically, gently move the vehicle slightly to prevent pads sticking.

Prevent Moisture and Mould

Moisture is one of the biggest threats to a standing car.

Use silica gel packs or moisture absorbers inside the cabin.
Ensure windows are fully closed.
Avoid damp storage environments.

If the vehicle smells musty when reopened, ventilation is required immediately.

Consider SORN If Not Using the Vehicle

If the vehicle will not be driven or kept on a public road, you may declare it SORN with the DVLA.

This means:

You stop paying road tax
The vehicle must remain off public roads
It cannot be parked on public highways

SORN saves money but must be used correctly. Driving a SORN vehicle on public roads without tax is illegal.

Insurance considerations should also be reviewed. Some insurers offer laid up policies for stored vehicles.

Use the Vehicle Occasionally if Possible

The best maintenance for a car is use.

Driving periodically:

Charges the battery
Lubricates engine components
Prevents brake seizure
Maintains tyre condition
Circulates fluids

Even a short drive every few weeks helps preserve condition significantly.

If safe and legal to do so, aim for a proper drive rather than simply idling the engine.

Getting the Car Back on the Road

When returning a standing car to regular use, follow a careful process.

Checklist Before Driving

Check tyre pressures
Inspect fluid levels
Look for leaks
Test brakes gently
Confirm battery health
Ensure MOT is valid
Ensure vehicle is taxed
Ensure insurance is active

Do not assume everything is fine simply because the car was stored carefully.

If the vehicle has been unused for many months, consider a professional inspection before full return to daily use.

Long Term Storage Over One Year

If storing for over a year, additional measures may be required.

Professional vehicle storage services offer climate controlled environments. These may be worthwhile for high value or classic vehicles.

Extended storage without proper care can result in:

Seal deterioration
Fuel system damage
Electrical corrosion
Brake component seizure

Planning ahead prevents costly repair bills later.

Final Thoughts

A standing car requires active care, not passive neglect.

Clean it thoroughly.
Store it properly.
Protect the battery.
Monitor fluids.
Prevent tyre damage.
Control moisture.
Use it periodically where possible.

Cars are mechanical systems designed for motion. When you cannot drive them, simulate care and preservation wherever possible.

Proper preparation protects both your investment and your safety.

Frequently Asked Questions

How long can a car sit without being driven?

Most cars can sit safely for several weeks, but battery discharge and tyre flat spots can begin within a month if no preventative measures are taken.

Should I start my car regularly when it is not being used?

Yes, but it should be run for at least 20 to 30 minutes to allow proper battery charging and fluid circulation rather than short idle periods.

Can tyres be damaged by standing too long?

Yes. Tyres can develop flat spots if left in one position for extended periods, especially in cold weather.

Do I need to SORN my car if I am not using it?

If the vehicle is not taxed and is kept off public roads, declaring SORN is required. It cannot be driven or parked on public highways while SORN is active.