E46Fanatics - View Single Post - 03 325i 152,xxx mi wont start. Need help!! URGENT!!
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Old 12-13-2011, 09:43 PM   #27
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Join Date: Mar 2011
Location: Denver
Posts: 2,930
My Ride: 325Ci
Originally Posted by Stinger9 View Post
Because the head of Porsche engineering explained that all their cars are designed to run on regular gas with no problems as they are 'world cars' and will run in countries where premium is never available. That is why the term 'recommended' is always used.
BMW has stated the same sentiment in slightly different terms, and tunes their cars so that they adjust to 89 octane with no problems. That's what our knock sensors and ECM are for.

I just wanted to tell him to use premium(whats recommended). Of course he can run 89 or lower if he wants to, but it will give bad gas mileage and make the engine work more. The engine will adapt itself to burn more fuel because of less octane hence, will have to work more to burn more fuel.
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