BMW 328i filled with regular unleaded

[taxfree4]

Some additional clarification - a modern car ( incl. your BMW ) with a high-octane fuel requirement can be safely run on lower-octane gasoline. Modern vehicles are equipped with a knock sensor, which will automatically detect knock events and then retard ignition timing to prevent knock. It will result in slightly less engine power, but unless you spend a lot of time driving around at full-throttle, the odds are you won't notice any difference at all. It won't hurt anything, either. The engine is designed to be able to safely run on low-octane gasoline for extended periods of time.

The "warning light" is not related to the difference of octane number . Most likely it's effect of computer read-out of any other malfunction , which came in time of re-fueling the gas . You need to diagnose your car in reputable shop .

You have single-handedly restored my belief that intelligent life resides in New Jersey, you are the man. I have never used high test in any of my cars or bikes. You have no choice on the water, it's all hi-test here.

[Limoles]

You have single-handedly restored my belief that intelligent life resides in New Jersey, you are the man. I have never used high test in any of my cars or bikes. You have no choice on the water, it's all hi-test here.

This is proving again , that all cars being on the roads in USA are the best among best in the world and all of them can take
(technically speaking) huge ABUSE . Yes - we might understand now , why our gas is cheaper then that in Europe . If I tell
you , that "worst" petrol grade sold in Europe has 92 octanes ( and going up to 99 ), it will clarify the question : "Why is so" ?
Well - OCTANES contain structural isomers (stereoisomers) , which are costly in production and consumers must pay for it .
Octane boosters are required for immediate response in "stop and go" habits in smaller european cities or even highways .
Americans driving cars with much more powerful engines and traditionally , most of them are overbuild and do not need any
enhancements on longer distances ( which we are famous of ) . So , re-assuming this , using hi-octain gasoline is the only
factory recommendation in hi-performance cars and thanks to self-adjusting sensors , we can use lower petrol grades without
sacrificing pleasures of driving them . However , there is another factor related to temperatures and time of fuel burn-out
in combustion chambers , which definitely increases performing responsiveness in racing cars or motorcycles , that's why
these vehicles needs much higher quality of gas .

[Brian D]

That's a nice looking car. I always loved bmw's but scared to buy one cause of maintenance costs (so I've been told). I would run that cheap gas out or try to siphon it out. I'm a firm believer if the car calls for premium then that's what it needs to run and perform how it was built to do. Kinda ironic the problems didn't start until it was filled with 87 octane. goodluck and I hope it all works out

[grendl]

Before you go too far on additves or anything(all of which may be good suggestions) a question
When she put gas in it did she tighten the gas cap and make it click a couple of times?
Dont know BMWs but most American cars go to the shop with a check engine light and all it is -is the gas cap is not on tight. Causes a vacuum leak and there's your check engine light. If you haven't checked,take the cap off,then put it back, making sure it clicks a couple of times.
Sounds silly but check it out..

[CheesyRider]

I should have updated this thread when the problem was resolved. The misfire was just a coincidence and had nothing to do with the gasoline grade. A coil was bad. It has been replaced and the car has been running great. Thanks everyone!

[srt8-in-largo]

Where am I... what year is this... why didn't the guy at the auto store put a scanner on it and read the code?? Problem indicated... solution imminent. I guess he really wanted to sell that Seafoam

Octane ratings are calculated differently in different parts of the world, so 92 or 99 in Europe may not coincide with the same numbers here, yes?

Octane boosters do work... they are not snakeoil. Torco or Lucas are the most popular brands.

Cars that call for premium gas, should get premium gas. Sure the knock sensors will pull 5 to 20 degrees of timing and keep things putting along... but that's because... your engine is DETONATING from the lower octane.