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Maintaining your car when not driving regularly

Mercedes-Benz Service Care

During these unusual times, you may not be able to get out and about in your car as much as you’re used to. Many of you might be wondering what to do with your car if you aren’t driving it on a regular basis. We here at Mercedes-Benz of Bath have attempted to provide answers to the most commonly asked questions.

What to do with your car, and how to maintain it, depends on how long you’re leaving your car idle. For example, you may be using it to top up on food and supplies or driving it if you work in an essential job or industry. But for many, you may not need or want to use your car for a lot longer, maybe even months.

Remember that even if you’re not using it, you’ll still have to insure your car unless you make a Statutory Off Road Notification (SORN). You can only make a SORN if your car is being kept off the road

Frequently asked questions:

How long can you leave a car without starting?

How long you leave a car without starting can depend on the condition of your car's 12-volt battery. Most modern cars with a fairly healthy battery should last at least 2 weeks, without needing to be started up to re-charge the battery. If there’s any doubt about the condition of the battery, start it once a week just to be safe.

What happens if you don’t drive a car for a long time?

Even if you haven't driven for a while your car should be fine. If it's been regularly started and run for 20-minute periods, the battery should work. The tyre pressures should be checked and adjusted before driving. The brakes may have some corrosion on them, especially if the car was wet when it was parked up. Drive carefully and test the brakes as soon as possible. Make sure you use your brakes for the first few miles to clean off any corrosion.

Can I leave my car parked for a month?

Cars are made to be driven but with good care it should be fine. If it's left unused for an extended period of time, follow these guidelines to keep the car ready to drive.

How long can a car sit before the battery runs out of charge?

As we've said above, there are many factors that can affect this. The age of the battery, how the car's been used and the temperature all affect the performance of a battery. If you follow our guidelines your battery shouldn’t let you down.

What if my MOT expires?

The government has announced a 6-month exemption from the MOT test, although your car must be kept in a roadworthy condition

Leaving your car parked for up to 1 month


Fuel:

Before parking your car up for a long period, it’s a good idea to top up with fuel. Not only will this help with other measures, but a full tank doesn't attract condensation, which could cause issues if allowed to build up over time.

Battery Maintenance:

If you can, connect your car's battery to a mains-powered battery maintainer. If you can't, start the engine once a week and allow it to run for about 20 minutes. This will re-charge the battery and help keep the engine in good condition. It’s important to allow the engine to run for this long so the battery can charge properly. In the case of petrol engine cars, it also helps to prevent engines from flooding with fuel. Never leave your car unattended with the engine running.

Brakes:

Sometimes when a car's parked up for a long period with the parking brake on, the brakes can seize. To prevent this it's good practice to release the parking brake and move the vehicle a short distance back and forth, at the same time as running the engine. You shouldn’t leave the parking brake off unless the vehicle is on private land with the wheels secured using wheel chocks.

Electric Vehicles:

EVs and hybrid vehicles have 12-volt batteries, the same as conventional cars. However, they charge differently. Pressing the start button, so the ready light comes on, will operate the charging system. Doing this for 10 minutes once a week should keep the 12-volt battery topped up. Some electric and plug-in hybrid vehicles can maintain their 12-volt batteries if they’re plugged in to the mains charger. Check your vehicle handbook for details on this.

Garages:

Don’t run a car engine inside a household garage as the exhaust fumes can be toxic. If you keep your car in a garage, pull it out onto the drive to run the engine to charge the battery.

Tyres:

Before driving the car after a long period parked up, check all of the tyre pressures and inflate if needed.

To help you get back on the road again, we will be ready and willing to provide a full service and/or MOT as soon as we receive guidance from the Government that it is safe to do so.