How long can a car engine sit without being driven?
So how long can you go without driving your car? If you have not prepped your vehicle for a long time of not driving it you should not let it sit for more than one month, and even then, you should try to start it up and drive it for 15-30 minutes a few times within the month.
If your car isn't started regularly, the battery can lose its charge and die within as little as two weeks. Think of it like running the car for a short 15 minutes every couple weeks as the vehicle “stretching its legs.” This is how essential it is for the longevity of the car and the battery.
Cars are designed to be driven, not to sit idle for months. When left unused, engine fluids start to break down, parts that aren't getting lubricated begin to corrode, and even worse, animals may move in, chewing on anything they can reach.
When it comes to the modern vehicle sitting in your garage today, you shouldn't let your engine idle. Your vehicle does not need more than a few seconds to start up. Leaving it idling actually can be detrimental, and it wastes fuel, which causes a negative environmental impact as well.
Beyond just your oil, all of your vehicle's fluids can become compromised when left sitting for too long. Your vehicle relies on coolant, transmission fluid, power steering fluid, brake fluid, and differential fluid, among others. Any issue with these fluids can present trouble for your vehicle.
You may have trouble getting your car started when it's time for your next drive. But with the proper preparation, it's possible to let your car sit for months (or even years) with no issues at all.
Fluids and oils go stale
When a car sits for a long time, fluids get stale and can pool in certain areas. “Older oil won't lubricate as fresh oil would,” says Yuvali. The oil keeps the metal components lubricated, so you don't get that ticking noise of metal hitting metal, or worse, the engine overheating.
Leaving a car stored for a longer period of time is never a good idea but 3 months is nothing critical so in my opinion the worst that can happen is a dead battery and maybe some low air pressure. If you leave the car parked without starting it once in a while, the battery will eventually run out in about a month.
After sitting for a few months, your battery (like most batteries would be at that point) has enough power left in it to take care of the low electrical-draw accessories, but not enough to turn the starter over fast enough to start the engine.
The answer to this pressing question is yes. As engine oil degrades with time, getting it changed at recommended intervals is imperative for maintaining the overall condition of the engine and your vehicle.
How do you treat an engine that has been sitting?
Depending on how long the engine has been sitting, you may want to remove all the spark plugs, add a few drops of oil into each cylinder, and crank the engine for a few revolutions before enabling the ignition, thus preventing a dry-start condition with the piston rings.
How long can gas sit in a car? Gasoline can last between three months and three years depending on the type of gas and if it is properly stored. It's important to note while all gas will naturally begin to degrade over time thanks to exposure to oxygen (also known as oxidation), all gas is not created equal.

Wastes gas. Leaving your engine running consumes gasoline. As a matter of fact, allowing your car to idle for two minutes is equivalent of driving a mile. You can waste almost a gallon of gas if you leave your car idling for more than an hour.
Get someone to start the car every two weeks and drive it for about 15 minutes if possible. Driving the car periodically has several benefits. It will maintain the battery's charge, help the car "stretch its legs," and keep the engine and other components adequately lubricated.
If there was nothing wrong with it when it was parked, it should start after taking a few precautions. Any gasoline sitting for that long untreated will turn into water and should be drained. The battery may be dead if the car is not started for a long period. The tires may also need air.
Start your car at least once a week and allow the engine to run for 15-30 minutes. This can help prevent the battery from losing its charge.
The answer is, you need to drive your car once a week. Your car battery loses some of its charge when it sits idle. If you have a car that has been sitting for a month or more, the battery may have drained to the point that you will need to jump-start the car.
Experts recommend driving your vehicle for at least 30 minutes a week, preferably at highway speeds. Why 30 minutes? Short trips in which you're constantly stopping and restarting the engine don't provide the time necessary to fully recharge your battery.
When you leave your car unused for long periods of time, the fluids in it aren't circulated through their systems often enough. This can cause the fluids to become coagulated or stale, resulting in damage or lowered effectiveness.
- Drive the car once a week. ...
- Check the tire pressure. ...
- Check the fluids regularly. ...
- Check underhood belts and hoses. ...
- Use a battery tender. ...
- Guard against insects and rodents.
What happens if you don't run your car for months?
Most commonly, cars that aren't driven very regularly will run out of battery. As you drive, your vehicle's battery is able to recharge, which is often why a battery can run for years without depleting its energy. If a vehicle is parked for a long time, the battery isn't able to recharge and will likely go flat.
Occasionally start your car…or not
There seems to be a more widely-held belief, however, that it is a good idea to start your stored car every 3-4 weeks. Those in favor believe this keeps the cylinders lubricated and removes moisture from operating components.
Depending on the age of your battery, the weather and where your car is stored, your battery could last for varying lengths of time, but giving it a good drive once a week is a safe bet to keep it powered up. Tires that are unused can lose pressure.
Dealers typically don't mind paying interest for 30 or even 60 days, but when the car has been sitting on the lot for 3 months, that's when they really start getting nervous. They start worrying about losing money on the car if they don't sell it soon.
References
- https://www.batteriesplus.com/blog/power/keep-car-battery-from-dying
- https://www.garageliving.com/blog/winter-car-storage
- https://www.motortrend.com/how-to/how-to-fire-an-engine-thats-been-in-storage/
- https://www.ontarioautocenter.com/news/why-you-should-take-your-car-for-a-drive-once-a-week/
- https://www.chapelhilltire.com/6-vital-checks-for-cars-left-sitting-too-long/
- https://www.erieinsurance.com/blog/how-long-can-your-car-sit
- https://www.lithia.com/research/car-maintenance/how-often-do-you-need-to-drive-your-car.htm
- https://community.cartalk.com/t/my-car-wont-start-after-sitting-for-a-few-months/73649
- https://www.rd.com/list/things-that-happen-to-your-car-when-you-dont-drive/
- https://wrecktifycollision.com/how-often-should-you-start-a-stored-vehicle/
- https://www.wbtv.com/story/32811461/car-idling-effects/
- https://www.realcartips.com/cardealers/041-manaufacture-date-of-a-vehicle.shtml
- https://www.sherwoodford.ca/blog/is-it-bad-for-your-engine-to-sit-and-idle-for-long-periods-of-time/amp/
- https://www.edmunds.com/car-maintenance/how-to-prep-your-car-for-long-term-storage.html
- https://www.midas.com.au/what-happens-to-your-car-if-you-dont-use-it-for-long-periods/
- https://veloce-vault.com/news/how-long-can-gasoline-sit/
- https://www.louscarcare.com/blog/what-happens-if-you-don-t-drive-your-car-for-long-periods-of-time
- https://www.quora.com/Is-it-ok-to-leave-a-car-stored-for-3-months
- https://fifthgear.biz/fifthgear-blog/what-happens-if-you-dont-drive-your-car/
- https://www.repairsmith.com/blog/starting-a-car-that-has-been-sitting-for-months/
- https://www.sftoyota.com/blogs/4887/do-i-need-an-oil-change-if-im-not-driving-as-much
- https://www.consumerreports.org/cars/car-maintenance/how-to-maintain-a-car-that-isnt-driven-much-a6412749580/
- https://www.quora.com/What-happens-when-a-car-sits-for-2-years