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Is regular unleaded ok for BMW 330ci?

It depends on the year of the car.

For 2001-2006 BMW 330ci models, the recommended fuel is premium unleaded with an octane rating of 91 or higher.

For 2007-2010 BMW 330ic models, the recommended fuel is premium unleaded with an octane rating of 98 or higher.

Using a lower octane fuel than recommended can cause engine knocking and other performance issues.