Quote:
Originally Posted by Maynard
Adding to this, and really the key for me, is damage control. The knock sensors limit, but can't stop those first few hits, more common with the lower octane.
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Well again, the manual says that 89 is the minimum, and 91 octane is recommended. So I can't see how 91 is going to cause engine damage. If so, why wouldn't BMW recommend 93?
I use 91, because I will go with the manufacturer's recommendation.
I ran CITGO 87 octane in my 4.6 liter 2005 Mustang GT for 10 years and that car ran stronger when I sold it than it ever did. The manual recommended 87.
My daughter bought a 5 year old 2003 Mini in 2008, but before buying the car my wife was concerned that the manual said the recommended octane was 91. My daughter was going to college at the time, and the wife just didn't want any unnecessary expenses. So we emailed Mini corporate and got back a very nice reply saying that 91 is recommended for maximum efficiency and performance, but 87 would not hurt the engine. So most of the time my daughter put 87 in it. I bought the car from her 3 years ago and have put 91 octane in it since, and the car has 101,000 miles now and there are no engine problems whatsoever.