Premium gasoline is for higher-performance engines and usually contains additional additives not found in regular gasoline. If you don’t put the right type of gasoline in your BMW 328I, it can lead to decreased fuel efficiency and even engine damage—damage that is almost always extremely expensive to repair.
Should you ever need to check what type of gasoline your BMW 328i—or any other vehicle you may own—takes, consult your owner’s manual for the manufacturer’s recommendations.