Quote:
Originally Posted by joec1101
I always go with the manufacturer's minimum requirement to get the best performance and efficiency. Anything under that I never do; anything over that I have done in the past on other cars, but it's a waste of money if it's over the manufacturer's requirement.
I wasn't aware that BMW had lowered the minimum to 89 on that model. Maybe it's a spec for vehicles not in the U.S. (?). If I remember correctly, octane ratings have different specs in different countries, so maybe that's why it's 89...
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Someone on the other thread mentioned that 89 was the minimum listed in the manual, but it also said 91 was recommended. I haven't confirmed myself.