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The 2011 BMW 323i takes SAE 5w-30 full synthetic oil with a 6.9-quart capacity. The oil helps keep the engine parts cool and lubricated, preventing wear and damage from parts grinding against each other. An oil change for your BMW costs between $90 and $110, and you should aim for one every 15,000 miles or 2 years. Look out for signs like louder engine noise, transmission problems, shaking at idle, excess exhaust, oil odors inside the car, or warning lights indicating the need for an oil change.
The preferred oil for the 2011 BMW 323i is SAE 5W-30 synthetic motor oil.