Every car in our care is fitted with a soft, breathable cover as standard
Storing a classic car over winter means protecting it from cold, damp and long periods of inactivity by preparing the fuel system, maintaining the battery, managing tyre pressure, and keeping the car in a dry, stable environment. Done properly, a classic can come through a UK winter in the same condition it went in, but it takes more than parking it under a sheet and hoping for the best.
For most owners, winter is the longest single stretch a classic car will sit unused. That combination of cold, moisture and stillness is exactly what causes the problems classic car owners dread: flat batteries, flat-spotted tyres, and the slow creep of corrosion in places you can’t easily see.
What Does Laying Up a Classic Car for Winter Actually Involve?
Laying up a classic car for winter means putting a set of simple precautions in place before the car stops being driven regularly, rather than just leaving it where it last parked. In practice, that means addressing four areas: the fuel system, the battery, the tyres, and the storage environment itself. Each one behaves differently when a car sits still for months at a time, and each benefits from a small amount of preparation.
Why Winter Storage Needs More Thought Than Summer Storage
A car left for a few weeks in summer rarely suffers much. A car left for four or five months over a damp, cold UK winter is a different story. Fuel can start to degrade, particularly where it contains ethanol. A battery left connected but unused will slowly self-discharge, and a deep discharge over winter can shorten its working life. Tyres sitting in one position, especially in cold weather when rubber is less pliable, are more prone to developing flat spots. And condensation, caused by swings between cold nights and milder days, can settle on bare metal, inside the engine, and under covers, encouraging surface rust.
None of this happens overnight. It’s the accumulation of small, preventable issues over a long lay-up that tends to catch owners out.
Preparing the Car Before It Goes Away
Fuel and Fluids
Modern fuels containing ethanol can absorb moisture over several months, which is worth bearing in mind before a long lay-up. Many owners choose to either run the tank down close to empty or fill it fully to reduce the air space where condensation can form, and some add a fuel stabiliser to slow the fuel degrading further during the lay-up. Which approach suits your car will depend on its fuel system, so it’s worth checking your handbook or asking a trusted specialist rather than following a fixed rule. The same applies to other fluids, if a service or fluid change is due, doing it before storage rather than after is generally sensible, but always follow your manufacturer’s guidance rather than a generic interval.
Battery Care
A battery left simply connected and unused will drain gradually over winter. A smart battery conditioner, such as a CTEK unit, is designed to maintain the battery at an appropriate level throughout storage without the risk of overcharging, rather than just delivering a single charge and stopping. Whether to disconnect the battery entirely or leave it on a conditioner depends on the car and your own preference; a conditioner has the advantage of keeping the battery ready to use, while disconnecting removes any parasitic drain from alarms or clocks but leaves the battery to self-discharge on its own.
Tyres
Tyres that sit in the same spot for months, particularly in cold weather, are more prone to flat-spotting. Checking and adjusting tyre pressures to the upper end of the manufacturer’s recommended range before storage is a common approach, and some owners periodically roll the car forward or back during a long lay-up to change the contact point. Always check your vehicle handbook for the correct pressures rather than guessing.
Covers and Cleaning
A thorough wash and dry before storage removes road salt, grime and moisture that would otherwise sit against the paintwork and in panel gaps for months. A breathable cover, rather than an airtight one, allows any residual moisture to escape rather than becoming trapped against the bodywork.
Step by Step: A Simple Winter Lay-Up Checklist
Wash and thoroughly dry the car, including the underside where practical
Check fluid levels and consider whether a fluid change is due before storage
Decide on a fuel approach, close to empty with stabiliser, or full, suited to your car
Set tyre pressures as advised in your handbook
Connect a smart battery conditioner, or disconnect the battery if you prefer that approach
Fit a breathable cover rather than a sealed one
Choose a storage environment that is dry, ventilated and reasonably stable in temperature
Common Mistakes to Avoid
A few habits tend to cause more harm than good over a winter lay-up. Leaving a battery connected to nothing at all is one of the most common, it will simply run down. Using a sealed, non-breathable cover can trap moisture against the paintwork rather than keeping it out. Storing a car in a cold, damp garage with no ventilation often does more harm than storing it somewhere colder but genuinely dry. And assuming the car needs no attention at all for months at a stretch, rather than an occasional check, means small issues can go unnoticed until spring.
Should You Start a Stored Car During Winter?
Whether and how often to start a car during storage is a question with varying advice, much of it depending on the specific vehicle. Briefly starting an engine without letting it reach full operating temperature can sometimes do more harm than good, as it allows condensation to form inside the engine without burning it off. If you do start a stored car, running it until it reaches proper operating temperature is generally considered better than a brief cold start. As with fuel and fluids, this is worth checking against your car’s handbook or a trusted specialist rather than applying a blanket rule, particularly for classics with carburettors or older ignition systems.
How The Car Den Approaches Winter Storage
At The Car Den, near Battle & Ninfield in East Sussex, winter storage is managed as part of day-to-day care rather than left to chance. Cars in our care benefit from CTEK battery conditioning, periodic tyre rolling, and engines started and run up to temperature where required, alongside regular visual checks. Storage takes place in a dry, steel-framed building with a damp-proofed floor, with our Premium Indoor option adding full climate control: insulated, dehumidified, infrared heated and fan-ventilated, with temperature and humidity digitally monitored 24/7. Every vehicle is covered with a soft, breathable cover as standard. As one of our customers, Denis Kaye, put it after storing his TVR with us: “The service was fantastic and the car was clearly looked after and checked thoroughly before being returned to me.”
Conclusion
Storing a classic car over winter doesn’t need to be complicated, but it does reward a bit of preparation. Addressing the fuel, the battery, the tyres and the environment the car sits in, rather than simply parking it and walking away, is what separates a car that comes through winter cleanly from one that needs attention come spring. Where managing all of this yourself isn’t practical, a dedicated storage facility can take care of the routine checks on your behalf.
Explore our storage options https://thecardenstorage.co.uk/storage-options and find the right level of care for your car, or call 01424 40 80 40 to talk through what your car needs this winter.
Frequently Asked Questions
How do I store a classic car for winter?
Prepare the fuel system, maintain the battery with a smart conditioner, check tyre pressures, give the car a thorough clean, and store it somewhere dry, ventilated and reasonably stable in temperature rather than a cold, damp garage.
Should I start a stored car during winter?
This depends on the vehicle; a brief cold start without reaching full temperature can allow condensation to form internally. If you do start a stored car, running it up to proper operating temperature is generally preferable to a short burst, but check your handbook or a specialist for your specific car.
Should I disconnect the battery for winter storage?
Either disconnecting the battery or using a smart conditioner such as a CTEK unit are both common approaches; a conditioner keeps the battery maintained and ready to use, while disconnecting avoids any parasitic drain but leaves the battery to self-discharge naturally.
Do tyres need special attention during winter storage?
Yes, tyres sitting in one position for months, especially in cold weather, are more prone to developing flat spots. Checking tyre pressures before storage and periodically rolling the car can help reduce this risk.
Is it better to store a classic car indoors over winter?
A dry, ventilated indoor environment generally protects a car better than an unheated, damp outbuilding, since damp air encourages corrosion and mould. Climate-controlled indoor storage offers an additional level of protection for higher-value or particularly sensitive cars.
Should I wash my car before putting it into winter storage?
Yes, a thorough wash and dry removes road salt, grime and moisture that would otherwise sit against the paintwork and in panel gaps throughout the storage period.
How long can a classic car safely sit in storage over winter?
A typical UK winter lay-up of four to six months is manageable with the right preparation and storage environment; beyond that, periodic checks become more important, which is one reason many owners choose a managed storage facility over leaving a car entirely unattended.
