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Fryer Oil Maintenance: Tips To Make Oil Taste Better & Last Longer
The fryer is one of the central cooking appliances in many restaurants and commercial kitchens. And central to every commercial fryer is the shortening or oil in the vat. Maintaining that oil is key to producing great-tasting product every time. Oil maintenance is more involved than you might think, and if done properly, can add significant time to the productive life of your fryer oil and improve the taste of your product.

Fryer oil is an organic compound. That means it breaks down naturally over time, just like any of the food product in your walk-in. At over 300 degrees Fahrenheit, that degradation process is accelerated. As if that weren�t enough, three things contribute to the even more rapid deterioration of fryer oil:

Oxidation � contact with air makes the oil �stale� over time, just like a bag of chips.
Hydrolysis � the presence of water in fryer oil is unavoidable when frying food product, but as water interacts with the hot oil, acidic compounds form that can really affect taste.

Polymerization � As oil breaks down, compounds form and bond together, which leads to surface foaming and the further breakdown of oil quality and taste. This process is made even worse by food particles, which will inevitably collect in the oil as product is cooked.

There are several things you can do to combat the three enemies of oil quality. Here�s some tips that address each one specifically:

Fighting oxidation: minimize fryer oil contact with the air whenever possible. The most common method for doing this is to cover the fryer vat when the unit is shut down. Also regulate oil temperature so that it doesn�t exceed 360 degrees Fahrenheit. During lulls, reduce heat to 280 degrees.

Fighting hydrolysis: don�t fill fryer baskets directly over the fryer vat. This is especially true for frozen product, because ice crystals will end up in the oil. Of the three, hydrolysis is the hardest to fight, because there is going to be water in everything you cook.

Fighting polymerization: again, don�t fill fryer baskets over the vat. Food particles speed polymerization, so a good technique is to load the fryer basket away from the vat and give it a few good shakes to allow any free particles to fall away before the product takes the plunge. Another polymerization agent are seasonings, especially salt. Add any seasoning away from the vat to keep them out of the oil as much as possible.

Of course, no matter how hard you fight, eventually it�s going to be a losing battle. Water, air, and particulates are going to end up in your fryer oil no matter what you do. Your only choice is to take them back out before the oil breaks down. You can do this effectively with a good filtration system.

How much you filter your fryer oil depends on what you�re cooking, in what volume, and how often. In general, breaded foods like fried chicken or fish mean you should filter more often, because of all the food particles that are going to end up in the oil. French fries are much cleaner and therefore the oil can handle a lot more rounds before filtering.

No matter what, you should develop a filtering schedule. Fryer oil test strips are the best way to keep track of oil quality, and they�ll give you a starting point for your filter schedule. Filtering fryer oil greatly extends the life of the oil, and smart restaurant operators filter the same oils several times to get the maximum life out of it before having to refill.

Portable fryer filters provide an easy way to filter fryer oil without slowing your busy kitchen down too much. And when you�ve squeezed every last minute of cooking capability out of that vat of oil, dispose of it safely with an oil transporter. Finally, use a Smart Spout for pouring new oil into the vat without spilling.

Before you refill with a new batch of oil, however, you�ve got to clean that fryer vat out. It�s a thankless job, but someone�s got to get in there and remove as much of that great friends of polymerization, food particulates, as possible. Especially focus on cleaning the �cool zone,� the area underneath the burners in the vat where particles are intentionally concentrated in order to prevent them from heating up too much during cooking. A water/vinegar mix is a great way to make sure detergents are neutralized after you�ve thoroughly cleaned the vat.

Maintaining fryer oil quality takes a lot of work. But in the end, it�s worth the extra effort because you get a lot more mileage out of each vat of oil. And if saving money isn�t enough of an incentive for you, then the prospect of serving great tasting fried foods to your customers every time should do the trick.



Envirowise is a government programme that delivers free, confidential environmental advice to UK businesses, enabling them to improve profitability whilst reducing environmental impact. Envirowise Homepage

HSE Catering information


HSE Risk Assessment




NetRegs contains simplified guidance based on complex and changing legislation, and does not constitute legal advice.




Food and Drink Index

Regional and Local Food-Guide

Defra Home Page



Directgov Homepage  Public services all in one place, brings together the widest range of public service information and services



Food Standards Agency Homepage  an independent Government department set up by an Act of Parliament in 2000 to protect the public's health and consumer interests in relation to food. A wealth of information is available to help with all aspects of foodservice industry



HM Revenue & Customs Homepage (HMRC) was formed on the 18 April 2005, following the merger of Inland Revenue and HM Customs and Excise Departments. They are here to ensure the correct tax is paid at the right time, whether this relates to payment of taxes received by the department or entitlement to benefits paid


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