How often should a car be started when left unused?

[DeBrooke]

It is recommended to start a small car at least once a week if left unused. The proper handling methods for long-term vehicle storage are: 1. Clean the vehicle thoroughly; 2. If storing for several months or longer, drain the antifreeze and engine oil to prevent deterioration; 3. When parking outdoors, place flammable items from the cabin into the glove box to prevent combustion; 4. Ensure the fuel tank is tightly sealed and avoid direct sunlight to prevent excessive temperatures; 5. Park in an underground garage or shaded area to avoid prolonged sun exposure; 6. Start the engine at least once per month and regularly check the battery; 7. Inspect all four tires plus the spare for integrity and proper inflation, maintaining adequate tire pressure to sustain appropriate load-bearing capacity.

[Angel]

I consulted with a technician friend at the 4S店, and they advised that it's best not to exceed two weeks. Long-term parking is most harmful to the battery. For example, my car wouldn't start at all after being parked for a full month, and jump-starting it cost me 200 yuan. Mechanical parts are also prone to issues; the oil can settle at the bottom, leading to insufficient lubrication, especially for turbocharged cars, which require extra attention. Don't just let the engine idle in place every time you start it. I always drive around the neighborhood for five minutes to let the water temperature rise and ensure the engine is fully lubricated, while also giving the tires a few turns to prevent deformation. If the car is going to be parked for more than three months, it's best to disconnect the battery or use a charger to maintain it.

[LeJace]

Last year, I left my car in the garage for three months during a business trip and almost had to replace the battery when I returned! The mechanic said modern cars have many electronic devices, like anti-theft systems and onboard computers, which consume power daily. A lead-acid battery can last at most 20 days. I learned my lesson and now make it a habit to warm up the car for ten minutes every Saturday when I go grocery shopping, allowing the alternator to recharge the battery. If you really plan to store your car long-term, here’s a tip: fill up the fuel tank to prevent moisture condensation, inflate the tires to 2.8 bar to avoid flat spots, and place paper under the wipers to prevent sticking. In northern winters, also pay attention to the antifreeze’s freezing point.

[AmyLynn]

Our car club conducted an experiment: after being parked for three weeks, the engine sounded noticeably rough and shaky upon startup. The principle is that metal directly rubs against metal after the oil film breaks, so my experience is to start the car at least every ten days. Especially for cars with automatic start-stop systems, AGM batteries are particularly delicate and can be ruined after just two instances of deep discharge. During the last maintenance, the technician also reminded me that long-term parking can cause brake discs to rust and stick, and you can hear a 'pop' sound when they break free on rainy days. Now, I've installed a remote start module on my old car, using a mobile app to remotely warm up the engine for five minutes every week without even having to go to the garage.

[AdelynFitz]

Lao Yang, who has been repairing cars for eight years, told me that different car conditions vary greatly. Older cars may leak electricity quickly and need to be started once a week, while new cars might still start after being parked for a month. However, the key is to monitor the health of the battery. If the voltage measured with a multimeter drops below 12V, you should be cautious. One of my clients owns a Mercedes-Benz S-Class that sat idle for six months while they were on a business trip, and they ended up spending eight thousand just to replace the battery and remove rust. Daily recommendation: If the car is unused for more than two weeks, start it and let it run for at least 15 minutes, raising the RPM to 2000 to fully charge the battery. For long-term storage, remember to disconnect the power supply to the dashcam.

[AlessandraFitz]

Painful lesson from a car modification enthusiast: My low-rider car was parked for a month and a half, and all four new tires were deformed, with flat spots worn into the rims. The modification shop owner said thin tires are more prone to losing their roundness and the car must be moved weekly to change the stress points. Additionally, hidden wiring for modified audio systems can secretly drain the battery—I once installed ambient lighting that caused a dead battery in just five days. Now, I strictly follow a bi-weekly startup routine: Turn on the AC to dehumidify and prevent mold in the pipes while warming up the car, deliberately press the brake in D gear to circulate transmission fluid, then turn the steering wheel a few times to lubricate the power steering pump. The whole routine takes about twenty minutes.