Letting any car sit still for a long time can lead to issues with the batteries, brakes, and tires.
Batteries can be drained even when the car is switched off if electrical items remain active (alarms, for example). Taken to the extreme, this could mean your car will fail to start just at the moment you need it. If your car is parked on property you own, you can overcome this danger by plugging into a “trickle charger,” which keeps the battery charged via a conventional wall socket. Failing that, you should start your car and run it for 15 to 20 minutes once a week or so. That will top off the battery as well as circulate fluids around the engine. Running the air-conditioning at the same time will help prevent mold from developing within your system.
When a car’s brakes aren’t used for a prolonged period, they can begin to rust on the surface. This in turn can make them noisy and cause them to seize. To prevent this from happening, roll the car backward and forward a few times. If you’re parked on private land and it’s flat, you can also leave the emergency brake off to prevent it from seizing. Be sure to leave the car in gear to prevent it from moving.
By rolling your car a few meters you can help prevent the tires from developing flat spots.