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The Global Insight

What happens if you put 87 gas in a 93 car

Author

William Harris

Updated on March 29, 2026

If you usually fill your tank up with 87-octane gasoline and you accidentally put in a higher octane blend (say, 91, 92, or 93), don’t worry. … You may feel a difference in the way the vehicle runs and may notice an improvement in gas mileage, but that’s about all that will happen.

What happens if you put 87 in a 93 gas tank?

If you usually fill your tank up with 87-octane gasoline and you accidentally put in a higher octane blend (say, 91, 92, or 93), don’t worry. … You may feel a difference in the way the vehicle runs and may notice an improvement in gas mileage, but that’s about all that will happen.

Is 87 and 93 gas the same?

Regular gas is rated at 87 octane in most states, while premium gas is often rated higher at 91 or 93. Fuel with a higher octane rating can stand up to higher compression before it detonates. Essentially, the higher the octane rating, the lower the likelihood that detonation happens at the wrong time.

Can you mix 93 with 87?

No, you will not damage your engine by mixing different octane fuel. It is still fuel. Say you mixed 2 gallons of 87 octane with 2 gallons of 89 octane and 2 gallons of 93 octane.

What happens when you 87 instead of 91?

If you choose to use 87 octane the engine will not provide the best performance, but you will not damage it. If the manual says min 91 octane, that means the engine and ECM are not able to safely use fuel with an octane lower than 91. You run the risk of damaging the engine.

Can I mix 87 and 89 gas?

Is it okay to mix 87 octane and 89 octane fuel together in my car? Yes. You will not harm your car by mixing different octane grades of the same gasoline providing your car’s engine is designed to run on less than 89 octane fuel and you are not using E85 in a non-E85 compatible engine.

What happens if you put the wrong gas in your car?

Typically, although there are some variations among engines, putting a higher-octane gas into your car than it requires will neither help nor hurt your car’s performance. … This mistake should not cause any major damage to your car – just be sure to pick the correct octane gasoline next time you fill up.

Is 93 a premium gas?

Premium gasoline is generally considered any type of gasoline with an octane level of 91 or greater, with 91 octane and 93 octane being the most common versions of premium gasoline available at gas stations in the United States (93 octane gasoline may be called “ultra” or “super-premium” in some cases).

Does 93 octane gas last longer?

93 octane fuels are more refined and contain more stable hydrocarbons. These stable hydrocarbons can last 2-3 times longer than 87 octane fuel. Even in proper storage 87 octane gas can start to degrade in 3 months, 93 octane fuel should last closer to 9 months before degradation is noticeable.

Will premium gas clean my engine?

Nope. Regular, plus, and premium gas all come with detergents to mitigate against carbon deposits in your engine. Plus and premium don’t come with special powers for cleaning out the engine. If you’re interested in cleaning out your engine, you’re better off taking it in for service.

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Can I put 93 gas in my car?

Most cars on the road recommend a standard grade 87 or 89. Premium gas 90-93 is completely okay to put in a standard vehicle. Car experts say there is no risk of damage to a standard car using premium fuel.

Is unleaded 87 regular gas?

In the U.S., unleaded gasoline typically has octane ratings of 87 (regular), 88–90 (midgrade), and 91–94 (premium). Gasoline with an octane rating of 85 is available in some high-elevation areas of the U.S. (more about that below).

Will higher octane gas hurt my car?

The higher octane gives premium gas greater resistance to early fuel ignition, which can result in potential damage, sometimes accompanied by audible engine knocking or pinging. … It’s the fuel’s ability to be compressed more without pre-igniting that results in more power when used in the appropriate engine.

What type of gas is 93?

Premium gas is usually considered to be any gasoline that has an octane level of 91 or higher. You’ll usually see these listed on pumps as 91 or 93. Sometimes, 93 octane will be listed as “super-premium” or “ultra.” Unleaded gasoline is usually considered to be “regular” when it is 87 octane.

Can I use 91 octane instead 93?

It’s fine mixing them, and this is essentially the reason that you can put a full tank of 87 in and an octane booster will—when mixed throughly—be 91 or above if you put the right amount in. So putting 91, 92, 93 in are all fine for your car.

What happens when you mix 93 and 95 petrol?

Yes. There is no harm in mixing different octane grades.

Is putting the wrong gas in your car covered by insurance?

Ultimately, misfuelling is a common exclusion on auto insurance policies. Most insurance policies specifically exclude any damages caused by putting the wrong fuel in your vehicle. Even if you have full coverage or comprehensive coverage, misfuelling is not likely to be covered.

What happens if I put unleaded 88 in my car?

Turns out, some car owners should steer away from using it, even though it can be cheaper than the standard 87 octane fuel that is 10 percent ethanol. … The 88 octane should have no effect if you happened to fill you tank with it once, but prolonged use by a car not equipped for it can cause an engine to wear out faster.

What happens if you put 85 gas in a 87 car?

If you’re running an 87 octane engine hard, at sea level, with 85 octane fuel, it is possible to damage the engine. Thankfully, most modern engines have a very good sensor for detecting if the engine combustion process is poor due to having low octane fuel.

What happens if you put 87 octane in a Mercedes?

Although 91 octane is recommended for a majority of Mercedes-Benz models, it is not extremely harmful to put in 87 octane. This lower grade octane will not maintain the vehicle’s performance level, but it will not harm the engine because the computer system will know that the fuel is of a lower grade.

What happens if I accidentally put regular gas in my Mercedes?

If you mistakenly fill up with regular fuel, your car’s ECU will adjust engine timing and performance to work with the lower-octane fuel. In most cases, this is ok for the times when there are no premium pumps around, but it’s not ideal to run the cheapest fuel possible for extended periods of time.

Does 87 gas burn faster?

Fuel with an 87 octane rating burns more quickly while higher-octane fuels burn more slowly. In engines designed for standard unleaded fuel, efficiency and performance is optimized for 87 octane and could actually perform worse with higher-octane fuel since the burn rate is slower.

Is too much octane bad?

If you run too much octane in your engine it won’t run very well because the burn is way too slow. … If the octane is too low, the fuel will burn too fast and too hot which causes detonation and leads to sure-fire engine damage.

What is 93 AKI fuel?

In the U.S., the average of RON plus MON, also known as AKI, equals the minimum octane rating for unleaded motor fuel, or the number you see at the pump! Often, you’ll see the octane number of 87 (regular), 89 (mid- grade) or 91-93 (premium) when you fill-up.

Is 87 or 89 gas better?

The general consensus is that using premium gas when your car can run on regular gas doesn’t deliver any extra benefits when it comes to engine life, fuel economy or reduced emissions. If your engine uses higher compression ratios, typically you will need to use higher octane-rated gas.

Does 93 octane gas contain ethanol?

All gasoline brands have both pure and ethanol-containing gasoline under the same brand names. For example, Shell V-Power ranges from 91 to 93 octane both with and without added ethanol. It just varies from station to station, and it’s up to the station owner whether or not to sell pure gas.

Why is topping off bad?

Topping off your gas tank can cause pressure to build in the tank and flood the carbon filter vapor collection system, only meant for vapor. Subsequently, this overflow can affect your car’s performance and could possibly damage the engine.

Does premium gas last longer?

Sadly, there’s nothing in premium gasoline that would make it last longer than other fuels from the pump. Since the distinguishing feature is the higher-octane levels, the only real benefit you gain is lowering the chance of engine knocking, which isn’t much of a threat on most modern fuel systems.

Is 87 or 88 gas better?

Unleaded 88 burns cleaner and cooler than regular unleaded gasoline. NASCAR mechanics, automakers, and regulators all agree Unleaded 88 is safe, affordable, and a greener choice for engines.

Does Texas have 93 octane gas?

StateTexasRegular Unleaded87Mid-Grade Unleaded89Premium Unleaded93NotesEl Paso area has 86/88/91 octane ratings

Does higher octane matter?

The higher the octane rating, the better the gas resists knocking. Knocking occurs when gasoline detonates at the wrong time in the ignition chamber due to the compression the fuel undergoes. Octane ratings usually come in three grades. Regular-grade gas has an octane rating of 87.