What happens if i put 87 instead of 91

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Reach out today to see how we can help your business save money. Nov 9, General Information. Tags: diesel , engines , fuel , maintenance , repairs. Some vehicles which are recommended premium can actualy opperate fine with reg, but will have a small reduction from it peak potential performance. If the owners manual says premium is required or can only be fueled with premium then that instruction should be followed to avoid knock or detonation.

Since its a newer BMW you might notice some slight knocking and reduction in performance. The knock is due to the 87 octane fuel igniting before primary ignition is supposed to occur. Turbo charged vehicles like your BMW 3 require a higher octane fuel to prevent knocking due to the higher cylinder pressures in your engine.

I think BMW actually recomends against fuel additives in the owners manual. If you notice any knocking its best to just drive easy, get down to a quarter or half tank and refuel with premium. Eventualy after refueling enough times the avg octane of the fuel in your car will get back to where it should be. Guru5YS7K, Sometimes it takes the computer awhile to recalibrate, even after the correct fuel is in use. Should go faster if you put in Premium, and drive easy till the computer recognizes knocking is no longer occuring.

Just a guess but did you add alot of octane booster to achieve an overall in your tank? If so its better to just refuel as you burn off the lower octane fuel.

Guru99KBTW answered about a year ago. Do i need to empty it and put premiolum again. Guru9T5FY9 answered 7 months ago. I put 87 instead of Is gann happen to my car damage please answer me because I am so scary. What do i need to do? I was wondering if I could put diesel oil full synthetic in my i BMW hundred seventy thousand miles on it. Review another car.

Every automaker is going to be different in this regard, since the ability to analyze this knock quickly depends on the skill of the programmers and calibrators and even the speed of the PCM processor.

So, if you put in a lower octane fuel, and then go drive your car hard, press the accelerator quickly, it is possible to experience heavy knock, and possible engine damage.

I will say, it is unlikely to actually happen in cars produced in the last few years, but you are certainly exposing your engine to the possibility. When engineers say to use a certain fuel, we have good reasons for doing so. So if you accidentally press the wrong button at the pump, make sure to use the correct octane next time.

A mechanic once advised me to run 2 tanks of premium, name brand fuel, back to back, once a year.