What To Put In Gas Tank to Ruin Engine? – A Complete Guide

Despite the costly repair processes, many drivers feel inexplicably generous about people borrowing their automobiles.

Worse, parties and celebrations are even held in these cars on special occasions, with tons of food and beverages stored inside. What an open welcome for disasters!

Just a slight misstep, and your engines will suffer from considerable damage. Our article will discuss what to put in gas tank to ruin engine. Stay tuned!

What To Put In Gas Tank to Ruin Engine? 10 Things To Put in Gas Tank To Ruin Car

What To Put In Gas Tank to Ruin Engine?

Wrong fuel, excessive oil, water, coke, salt, bleach, urine, sugar, hydrogen peroxide, and brake fluid can be harmless in other cases but extremely deadly to your car motor. Be cautious! 

1. Coke/Coca-Cola


What will ruin a gas engine? Our first answer is Coke – the notorious killer of car motors. And actually, not just Coke; any soft drink can lead to complete engine destruction if its amount is high enough.

In essence, with the Coca clogged up inside your engine, its chemical composition will mix with the car’s gasoline, turning the entire compartment into a caustic sludge mess that brings about severe damage to the motor system.

Fortunately, a notable warning sign can tell you whether someone malicious has put some Coke in the gas tank: the secret lies in the excessive emission of fumes.

Hence, remember to check the engine oil or exhaust gas carefully. If they seem neutral, go on to inspect the automobile engine components.

2. Pure Water 

Pure Water

Apart from coke, what to put in gas tank to destroy engine? Not many people expect pure water. But in fact, it’s the death of all vehicles. Shocking, huh? 

As the water is mixed with fuel, the engine will be detached from its engine mount, hampering the automobile’s efficiency.

However, you will barely notice any symptoms in the first few hours and keep driving with no suspicion.

Then, the car will repeatedly alternate between smooth runs and stuckness – till it comes to an eventual stop amidst the road. Trust us; nobody wants to experience this disaster in their entire life!

So how much pure water is detrimental? Well, even a few drops are more than enough, let alone full cups! That’s why you should raise your guards more than ever.

The presence of water content in a fuel tank does send out some common signals, fortunately. They include:

  • Misfires: A direct consequence of water lodging in your cylinder’s combustion chamber.
  • Rough acceleration: It’s the most popular warning – and the easiest to locate.
  • Check engine light: Malfunctioning or blinking lights are the telltale implication of invaded liquids.
  • Rough idle: Does your car constantly fall into the rough idle mode when the AC is turned on? That clearly implies stalled engines!

In these cases, displacement will be the best counterattack – since it helps remove old, contaminated fuel to substitute it for high-octane gas.

3. Excessive Engine Oil

Excessive Engine Oil

Surprise! Engine oil can also wreck the engine tank. Who could have thought of?

But in fact, either too low or too much oil level is not good for the vehicle engine – especially the latter, as they subject your car to quiet but permanent damage.

How so? By inserting more oil than necessary, you have allowed the hydro to lock your car’s piston, keeping it from sufficient air circulation for consistent movements.

Worse, the oil compression process will fail to transpire, making the position tilt or even break.

Most car criminals or pranksters like to use this nasty trick on people they hate, since it’s among the best ways to destroy a car engine without evidence. The chances of getting caught are almost zero!

For this precise reason, it’s a must to visit an auto repair shop on a frequent basis before your engine damage is beyond saving.

4. Bleach


Driving with bleach in gas tanks equates to immense danger. Should the engine’s contact with bleach persist for longer than allowed, it will corrode, leading to major damage for the rubber and metal parts.

That’s expected, though, since bleach corrosion occurs much faster than other liquids.

Some readers may argue, how come? After all, isn’t water the main component of bleach? While that’s not wrong, do not forget that bleach also contains a small amount of chlorine.

Chlorine and water might be pretty harmless if separated, but when they combine… well. There’s a reason scientists refer to bleach as a corrosive and caustic element! 

Similar to excessive oil, bleach can destroy engines undetected – a reason why malicious people strive to learn how to ruin a car engine through the gas tank with bleach.

Fixing flooded engines are possible, but damaged ones are simply hopeless.

So make sure you always exercise proper safety precautions; otherwise, a visit to a professional mechanic for thorough replacements can cost thousands of dollar.

5. Salt


How to ruin a car engine with salt? Salt in fuel gas tanks will corrode their bottom; once mixed with the car’s gasoline, these salt crystals will slip into your fuel pump, blocking its filter and paralyzing the entire engine.

As your car gets hotter, it will refuse to start!

Then how about a very small pinch of salt? Is that enough to cause harm?

Indeed, a tiny amount might not wreck that much havoc compared to other ingredients.

Still, they might lead to massive engine power loss if sustained long enough inside the car. So all in all, always keep a close eye on them!

6. Sugar


What to put in the gas tank to kill engine? Behold, an ingredient familiar to almost every household – sugar!

Sugar granules turn the tanks’ fuel to surgery petroleum. Instead of dissolving, it will clog up your fuel filter and spread all over the bottom.

As there are lots of other relevant ingredients in sugar (such as waffle syrup, molasses, honey, sticky liquid, and more), imagine the total catastrophe your car is subjected to! It will get screwed up entirely.

Remember to scrub the fuel pipe, filter, and other parts to get rid of all their traces.

Fortunately, some high-quality car models have sturdy filters to keep sugar from advancing further, which is why professional assistance for this issue is cheaper than other types of damage.

Here are some symptoms to bear in mind:

  • Consistent fuel pump failure
  • Stalled engine
  • Difficult time to get the car started
  • Low-quality engine performance (one you will observe when driving)

7. Urine


Urine is another favorite ingredient for all those bastards out there who want to learn how to destroy engine through gas tank.

Still, if there’s only a very small amount, you can be rest assured – they are as harmless as a droplet of rain.

Otherwise, huge quantities obviously means bad news! (Wow. Does that mean literally any liquid other than gas can destroy your car? Seems ridiculous, but yes).

So should you spot anything strange with the gas tank, wipe its fuel pipe and filter immediately.

8. Brake Fluid

Brake Fluid

Isn’t brake fluid a critical element of the vehicle’s hydraulic clutches and brakes? Why can it ruin the engines then?

Like gasoline, a sufficient amount of brake fluid can boost the car’s overall performance. Too much of it inside the tank, however, will wear the motor down, putting you afront greater risk.

Avoiding such disasters is not that hard at the end of the day; simply remind yourself to keep the fluid level in check and flush the brake fluid every two years.

That way, you can sidestep unfortunate and deadly accidents on the road.

9. Hydrogen Peroxide

Hydrogen Peroxide

Hydrogen peroxide can surge the car’s horsepower and speed it up like nothing else. However, once it’s mixed with gasoline, that screams a big NO.

A mixture of hydro-pero and gasoline raises the car’s burn rate, putting its engines at higher temperatures.

During unexpected acceleration, the motors will burn up before killing your pumps entirely.

10. Wrong Fuel

Purchasing the wrong fuel is a case occurring for many people.

If you encounter this unfortunate situation, never start your engine immediately, or else both you and the car will be at risk! Put it in neutral and turn to the assistance of experts.

What Are The Critical Steps To Take If Someone Has Put Things Into Your Tank?

Stop driving immediately to avoid worsening the situation.

Next, write a report to the police and insurance company, who will send a specialist to check the damage for you. Finally, bring the vehicle to mechanics for a thorough fix.

Chances are, your repair costs will be at least partially covered by the insurance agent, which can lift quite a huge pressure off your shoulder!

1. Stop Driving

If you feel absolutely certain that your tank is suffering from technical issues, stop driving right away. Any further operation will only gum up the fuel filters, leading to permanent harm!

It’d be terrific if you could notice unusual signals before kick-starting the engine.

Not only does it require much less fixing, but you yourself can also sidestep unwanted situations (like being stuck on an empty street with no way to bring the car back!)

2. Report To The Police (If The Car Breaking Down Is Not Your Fault)

Do not hesitate to write a report to the local police: wrecking someone else’s car is literally a crime!

Describe in detail where it took place, notable symptoms, and anything you could remember that may persuade the incredulous policeman that someone was really trying to destroy your automobile.

Aside from earning you your well-deserved justice, these reports would also prove quite helpful for a repair mechanic.

3. Contact An Insurance Agent

Once you have made sure someone has played cruel tricks on you on purpose, it is time to contact a trustable insurance agent!

The agent will send a tank specialist to inspect your car further, check for damage, and report the estimate to you.

Replacement costs for these broken compartments will be 100% or partially covered by the insurance company. Do not forget to let the repair shop know about that when you take the vehicle there! 

It would be best to do all this on the same day the car’s problem was identified. Who knows what other pissues your car might face, so do not waste your precious time! 

4. Use Protected and High-Quality Doors For The Tank

Most car mechanics report their customers’ startling tendency to pay no attention to their tank doors. Worse, some people don’t even use one in the first place! 

We strongly suggest you purchase quality tank doors from now on, and remember to lock them every time you fill up the car’s fuel.

Also, broken or faulty doors must get replaced as quickly as possible. The more protection there is, the less danger your automobile is prone to!


1. What Can I Put In The Tank Without Ruining It?

Well, nothing other than gas. Gasoline does not fuse well with any liquid, which means your car will suffer regardless of what you put in there.

We cannot stress enough the importance of a sturdy and potent tank door!

The only exception is probably a fuel stabilizer, which most drivers often pour into the tank if they plan to store the car for months without usage (especially in winters).

The vehicles will restart much more effortlessly once their owners feel ready to take them out again. These stabilizers are fairly simple to use, too.

2. Does Ethanol Hurt My Gas Tank?

To this day, there is still much debate about Ethanol. While some claim it increases durability and horsepower, others report massive damage to the fuel pump and increasingly more moisture.

Our final verdict is that, unless your vehicles are flex-fuel, simply avoid this additive altogether (just in case!).

3. How Much Does Engine Replacement Cost?

These services are never cheap, always spanning from $3500 to $5000. Sports or luxury cars will charge even higher – 50% than regular automobiles.

Furthermore, labor prices might fluctuate from $60 to $80 per hour. Understand why you should protect your engines at all costs now? 


This article has discussed what to put in gas tank to ruin engine.

We know certain criminals might be reading our guides for ideas to destroy someone else’s cars, but listen: just don’t. No one can get away with his murder forever.

For further support on car maintenance, you can write to us any time.

Just remember that Bryan’s Garage refuses to answer questions we consider red flags, such as how to ruin the tank without evidence.

Other than that, all of our readers are welcome.

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