Updated at: 03-03-2022 - By: micdot

People are looking for solutions to reduce the environmental impact of using gasoline or diesel in a vehicle. However, if you’re looking for alternatives, you may have come across suggestions that vegetable oil or cooking oil can be used instead. What may be the reason behind this?

What happens when you put cooking oil in a gas tank? Because of its high viscosity, cooking or vegetable oil will be problematic for the engine to process. It is also possible for this oil to harden when the temperature drops. The engine can become clogged and damaged as a result. As a result, even if you have a solution, it will take some time to implement it.

Cooking oil is a popular alternative fuel for many vehicles since it is both environmentally benign and cost-effective. They can, for example, acquire it for free from restaurants, but they must filter it first. Diesel-powered engines may benefit from it, but that’s not the case for gasoline-powered ones.

What questions do you have about this topic? We’ll answer some of them here. This way, you’ll be able to see the dangers of using cooking oil or vegetable oil in your car’s engine. On top of that, you can decide whether or not it’s worthwhile to switch to a different fuel type.

Let’s get started right away!

What happens if you put cooking oil in a gas tank?

Only diesel engines can use cooking oil in their gas tanks. You can substitute vegetable oil if you have any on hand.

Although it’s not as simple as filling up your petrol tank with such, you should bear in mind The viscosity of vegetable oil, for example, must be considered.

As a result of the thick consistency of cooking oils like vegetable oil, your engine may have difficulty evenly dispersing it throughout the combustion chamber. So, part of the oil may be consumed and some may not. Engine blockage can result from using unburned fuel.

Cooking oil, such as vegetable oil, will be difficult to utilize with a gasoline engine. It’s because your engine’s gasoline pumps and lines aren’t capable of handling such a high-octane fuel. In addition, sensors in many new automobiles are incapable of adjusting to this fluctuation.

For the most part, a gasoline-powered car simply cannot run on cooking oil. In order to avoid engine damage, owners of diesel-powered vehicles must now make minor adjustments to their vehicles.

Its short- and long-term impacts will now be examined in greater detail.

Short term effects

If you’re in the market for an alternative to diesel engines, cooking oil like vegetable oil is an excellent choice.

For example, the user will save money by not having to buy diesel. If you reside in an area where it’s cheaper to buy oil at a supermarket, you’ll save money. It’s also free at most restaurants.

You’ll need to gather this information. You must first filter used cooking oil to ensure that it does not harm your vehicle.

Cooking oil isn’t made to power an automobile in any way. Thus, your engine’s performance may be improved or lowered as a result of this.

As a result, you’ll still be able to achieve higher performance from diesel than cooking oil. It’s better to have diesel in your automobile than to deal with the inconvenience of filtering and getting one.

In this manner, you can even guarantee that your car will run without a hitch.

Long term effects

If you want to save money, don’t use vegetable oil in your automobile instead of cooking oil.

As an example, if you plan on changing your engine, you’ll need to have it converted, or you can upgrade/modify it to suit your needs. However, the price of such can be quite high.

Cooking oil, whether it’s canola or vegetable, isn’t inexpensive. Compared to diesel, the price may be a little less. It’s still not going to be perfect, even if you spend a lot of money on the upgrades.

Finally, using diesel oil will maintain your vehicle’s performance at its peak. As a result, it has a lower risk of engine failure and malfunction.

Can cooking oil in a gas tank damage an engine?

Because of its high viscosity, cooking oil can wreak havoc on a car’s engine.

A high degree of viscosity is characteristic of the vast majority of cooking oils. Compared to regular gasoline, this oil is heavier. Consequently, it may be difficult for the vehicle’s engine to process and distribute the fuel.

The thicker and stickier cooking oil is as compared to ordinary fuel. As a result, poor engine performance will be the result.

Some cooking oils, like vegetable oil, can freeze at low temperatures, so keep that in mind. Because of this, it can build up in your engine and cause it to become clogged.

How much cooking oil in a gas tank will ruin it?

Any amount of cooking oil in a gasoline tank might cause major problems if it isn’t removed promptly. Diesel-powered engines, on the other hand, should run just fine using cooking oil.

As always, the amount of cooking oil in the gas tank will have an impact. Eventually, if a significant amount of it freezes, it may cause obstruction.

In addition, the engine’s internal structure can degrade over time if there is too much cooking oil in it.

Because of this, if you suspect that someone has put cooking oil in your gas tank, you must get your engine inspected.

Can you tell if someone put cooking oil in your gas tank?

If someone has poured cooking oil in your gas tank, you’ll know immediately. Your engine may experience misfires and stalling if your gas tank has ever contained frying oil.

Cooking oil has a tendency to harden, which can make it more viscous and difficult to handle than diesel or gasoline. When cooking oil is found in your gas tank, it may cause your engine to run poorly.

Immediately drain the tank of gas if you suspect someone has tampered with your fuel system by adding cooking oil. You’ll also need to hire an expert to fix it.

When your gas tank has cooking oil in it, what should you do? Remove it in what way?

How to get cooking oil out of a gas tank?

You must remove the cooking oil from your gas tank as soon as you discover it. The engine should be shut down and the gas tank emptied. In addition, a new fuel filter is required.

Having a drain plug or access to the trunk’s top would be ideal. If that’s the case, you’re welcome to peek. It can be found under the backseat of some vehicles.

Assuming this is the case, the oil can be seen settling to the bottom of the tank as a result. The high viscosity makes it appear as if there are floating droplets in the air.


What happens if you put cooking oil into a gas tank? Because of its high viscosity, cooking or vegetable oil will be problematic for the engine to process. It is also possible for this oil to harden when the temperature drops. The engine can become clogged and damaged as a result. As a result, even if you have a solution, it will take some time to implement it.

It’s safer to continue with diesel oil and avoid the potential problems that could arise from switching to cooking oil. However, if you’ve already mastered the ins and outs of the engine, you can continue to do so and reap the benefits.

However, if you don’t know much about engines, it’s recommended to stay with diesel to avoid damaging yours. If you are aware of the risks and know how to cope with them, you can use vegetable or cooking oil in your car.