What happens if you put 87 in a BMW?
James Craig
Published Jan 09, 2026
The short answer is - nothing. Most BMWs can run on regular gas so you aren't at any risk of causing damage to your brother's car.
Can I put 87 in my BMW?
The short answer is: NO! We do not recommend running low grade fuel in BMW's. While a few models might present this as a viable option when reading the owner's manual, Triangle Imports does not believe in that philosophy. The possible negative effects on your car from using regular fuel simply aren't worth it.
Will 87 octane damage my BMW?
“There generally isn't any harm done to the engine by using lower-octane fuel,” said a BMW spokesman, Thomas Plucinsky. “Because our engines do have very good forms of knock sensing and are able to deal with lower-octane fuels, you will not have any drivability issues. You will, however, lose some of the performance.”
Will 87 gas hurt my car?
A standard grade 87 or 89 is recommended by most cars. The 90-93 grade of gasoline is completely safe to use in a standard vehicle. Fuel that is premium is not likely to cause damage to a standard car.
What happens if you put 87 instead of 93 BMW?
The car will compensate for the lower octane fuel - power may be slightly reduced and your tank mileage may be different. However, it's extremely unlikely any engine damage will occur even if you "drive it like you stole it".
16 related questions foundWhat happens if I accidentally put 87 instead of 91?
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're actually filling your car or truck with a different blend of gas, which means it will burn differently in your engine.
Is 87 Aki the same as 87 octane?
87 AKI is generally the lowest octane rating and cheapest option. Next is mid-grade with 88-90 AKI. Lastly, premium or high-grade gasoline has an octane rating of 90-94 AKI. The different grades of fuel don't burn the same way.
What happens if I accidentally put regular gas in my BMW?
The short answer is - nothing. Most BMWs can run on regular gas so you aren't at any risk of causing damage to your brother's car. When you put regular gas in a BMW as opposed to premium, the car will recognize this and may run with a little less power and less timing but all components will work properly.
Can you put 89 gas in a BMW?
BMW states that the minimum AKI Rating is 89 in their manual so the engine should be fine with that fuel.
Can you put 93 in a car that takes 87?
Can You Mix 87 And 93 Together? In addition to 95 octane fuel running through the 87 or 89 octane engines, you have absolutely no harm to your engine. The 93 octane fuel will not need to be run in any circumstances. In fact, it won't improve how your car runs.
Does my BMW really need premium gas?
No matter your model, BMW recommends using only premium-unleaded fuel. That's not to say your BMW won't run on lower-grade fuel, but premium-unleaded fuel will maintain its quality in the long run, letting you drive at peak performance consistently.
Is it okay to put 87 in a 91?
“Use premium unleaded gasoline with a posted octane rating of 91 or higher. If the octane rating is less than 91, you could damage the engine and may void your vehicle warranty. If heavy knocking is heard when using gasoline rated at 91 octane or higher, the engine needs service.”
Is unleaded 87 regular gas?
Retail gasoline stations in the United States sell three main grades of gasoline based on the octane level: Regular (the lowest octane fuel–generally 87) Midgrade (the middle range octane fuel–generally 89–90) Premium (the highest octane fuel–generally 91–94)
What happens if u mix 87 and 89 gas?
Mixing premium and regular gas is not generally recommended, but doing so will have minimal impact on a vehicle's immediate performance. Only premium cars that require higher octane gasoline may see a minor performance decrease or engine knocking.
What happens if you accidentally put unleaded in a premium car?
Premium gas has a higher-octane level than regular gas; or, in other words, a higher resistance to detonation. As various pressures rise inside of the cylinder of the engine, this will also result in a temperature rise, and the gasoline will sometimes detonate, or, “explode” in the cylinder.
Can I put regular gas in my premium car?
Can I mix premium and unleaded gas? Yes, drivers can mix the two types of fuel. The combined gas types will result in an octane level somewhere in the middle — something the vehicle “will survive,” according to The Drive.
What gas is best for BMW?
BMW recommends that their drivers only use high-octane fuel, such as 91+ octane. This will help ensure you BMW performs at its best, though, as with any fuel option, there are some pros and cons to 91+ octane fuel.
Is 87 Aki the same as 91 Ron?
Rough AKI to RON Conversion Guide:
87 AKI = 91 RON. 91 AKI = 93 RON. 93 AKI = 98 RON. 100 AKI = 104 RON.
Do BMWs break down a lot?
Do BMW Break Down A Lot? No, BMWs do not break down at a higher or lower rate than other cars. RepairPal reports that the average BMW will need to visit a repair shop for unscheduled repairs 0.9 times per year.
What is Ron Mon octane?
The term RON refers to the research octane number and MON is motor octane number. The RON describes the behaviour of a fuel in an engine at low temperature and speeds while MON describes the behaviour of a fuel in an engine at high temperatures and speeds.
How much ethanol does 87 gas have?
Ethanol has a higher octane number than gasoline, providing premium blending properties. Minimum octane number requirements for gasoline prevent engine knocking and ensure drivability. Lower-octane gasoline is blended with 10% ethanol to attain the standard 87 octane.
What type of gas is 87 octane?
Gasoline with an octane level of 87 is considered “regular,” with gasoline sold at 89 octane often labeled “midgrade” by most gas stations.
Is 86 and 87 gas the same?
Low-octane fuel — rated 85 or 86 as opposed to the 87 for regular gasoline — is common in the Rocky Mountain states, said General Motors fuel specialist Bill Studzinski. The practice goes back to the days of carbureted engines, when lower octane helped vehicles run smoothly at altitude.
Is 87 or 89 gas better?
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.
What happens if I use 85 instead of 87?
In most states, regular unleaded is rated slightly higher at 87. In most cases, you won't experience any problems running 85 octane in an ordinary car when a few thousand feet above sea level.