Can You Leave Cooking Oil in a Deep Fryer?

If you’re considering buying a deep fryer, you might wonder if you can leave cooking oil in it. The answer is that it depends on how long you want to leave your cooking oil.

It is best to keep oil out of your fryer for longer periods, but oil can still be left in your deep fryer for shorter periods. However, oil should be filtered first to prevent food debris from rotting in the fryer.

How often should you filter the oil in your fryer?

It is important to change or filter the oil in your fryer after six to eight times of cooking French fries, or any other non-breaded food like vegetables. When you fry non-breaded poultry or meat, it is important to change the oil or filter it after every three to four times. If you fry breaded fish, make sure to change the oil or filter it after each use.

Signs that you need to change the oil

The oil in your deep fryer needs to be replaced when it starts to show signs of darkening, changes in viscosity, smoking, frothing, or any other off-odors. These are all indications that the oil is breaking down and will no longer be effective at cooking your food. If you see any of these symptoms, it’s time to change the oil.

Old oil can break down and become rancid

If you leave the oil in your fryer for too long, it can break down and become rancid. The heat from the fryer causes the oil to break down, and over time this can cause the oil to go bad. Parts of the oil that don’t go bad can become rancid in a matter of hours, and this will make your food taste bitter and foul-smelling.

Properly dispose of used cooking oil

When you’re finished cooking with oil, it’s important to dispose of it properly. Used cooking oil can be recycled, but it’s not always easy to find a recycling center that will take it.

Tips for storing cooking oil

Properly storing your cooking oils is important to preserving their quality and flavor. Here are some tips to help you keep your oils in tip-top shape:

Stay cool

Keep oils cool, similar to how they are stored in wine cellars. This will help prevent them from going rancid.

Avoid light

Light can quickly damage oil, causing it to go bad. Purchase oils in dark glass bottles and store them in a dark place to protect them from light exposure.

Check the expiration date

Make sure to check the expiration date on your oils before using them. Using expired oil can cause off flavors and other problems.

Author: Scott Sanders


All the information on this website - - is published in good faith and for general information purpose only. Planet 997 does not make any warranties about the completeness, reliability and accuracy of this information. Any action you take upon the information you find on this website (Planet 997), is strictly at your own risk. Planet 997 will not be liable for any losses and/or damages in connection with the use of our website.

From our website, you can visit other websites by following hyperlinks to such external sites. While we strive to provide only quality links to useful and ethical websites, we have no control over the content and nature of these sites. These links to other websites do not imply a recommendation for all the content found on these sites. Site owners and content may change without notice and may occur before we have the opportunity to remove a link which may have gone 'bad'.

Please be also aware that when you leave our website, other sites may have different privacy policies and terms which are beyond our control. Please be sure to check the Privacy Policies of these sites as well as their "Terms of Service" before engaging in any business or uploading any information.

By using our website, you hereby consent to our disclaimer and agree to its terms.

Some of the links on this page may be affiliate links. If you purchase a product or service through an affiliate link, your cost will be the same, but we will automatically receive a small commission. Your support is greatly appreciated and helps us keep going!
Copyright © 2023 Planet 997