## How Long Can Engine Oil Sit in a Car?
**Introduction**
Engine oil is a vital fluid that helps lubricate and protect your car’s engine. It circulates through the engine, reducing friction and wear on moving parts. Over time, engine oil can become contaminated with dirt, metal shavings, and other particles. This contamination can reduce the oil’s effectiveness and eventually lead to engine damage.
As a general rule of thumb, engine oil should be changed every 3,000 to 5,000 miles. However, this interval can vary depending on your driving habits, the type of oil you use, and the age of your car.
If you don’t drive your car very often, you may be wondering how long engine oil can sit in a car before it goes bad. The answer to this question depends on a number of factors, including:
* **The type of oil you use.** Synthetic oil has a longer shelf life than conventional oil.
* **The age of the oil.** Older oil is more likely to break down and become contaminated.
* **The storage conditions.** Oil that is stored in a cool, dry place will last longer than oil that is stored in a hot, humid environment.
## How to Tell if Engine Oil Has Gone Bad
There are a few signs that can indicate that engine oil has gone bad. These signs include:
* **Dark, sludgy appearance.** Fresh engine oil is typically light brown or amber in color. As it ages, it can become darker and sludgier.
* **Metallic smell.** If you smell a metallic odor when you open the oil cap, it could be a sign that the oil has broken down and is no longer protecting your engine.
* **Increased engine noise.** If your engine is making more noise than usual, it could be a sign that the oil is no longer lubricating the moving parts properly.
## What Happens if You Don’t Change Engine Oil Regularly?
If you don’t change engine oil regularly, it can lead to a number of problems, including:
* **Engine damage.** Contaminated oil can cause increased wear and tear on engine parts, leading to costly repairs.
* **Sludge buildup.** Sludgy oil can clog oil passages and restrict oil flow, which can damage your engine.
* **Increased emissions.** Old oil can burn more easily, leading to increased emissions.
## How to Extend the Life of Engine Oil
There are a few things you can do to extend the life of your engine oil, including:
* **Use synthetic oil.** Synthetic oil has a longer shelf life than conventional oil.
* **Change your oil regularly.** Follow the manufacturer’s recommended oil change interval.
* **Store your car in a cool, dry place.** If you don’t drive your car very often, store it in a cool, dry place to prevent the oil from breaking down.
## Conclusion
Engine oil is a vital fluid that helps lubricate and protect your car’s engine. It is important to change your oil regularly to ensure that it is clean and free of contaminants. If you don’t drive your car very often, you may be able to extend the oil change interval by using synthetic oil and storing your car in a cool, dry place. However, it is always best to consult with your mechanic for specific advice on how often to change your oil.
## Additional Resources
* [How to Change Your Car’s Oil](https://www.popularmechanics.com/cars/how-to/a184/how-to-change-oil-in-car/)
* [What Happens if You Don’t Change Your Oil Regularly?](https://www.caranddriver.com/features/g3327/what-happens-if-you-dont-change-your-oil-regularly/)
* [How to Extend the Life of Your Engine Oil](https://www.edmunds.com/car-care/how-to-extend-the-life-of-your-engine-oil.html)
