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Whether on a new car or a used car, synthetic oil needs to be changed less often than regular oil. European Auto Source recommends Castrol full synthetic for BMWs with an "oil change interval of approximately 15,000 miles or once a year." However, be aware that not following your maintenance schedule on a car currently under warranty may void the warranty.
Source:
aa1car.com: Synthetic Motor Oil
European Auto Source: Castrol TWS Motorsport 10W-60 Full Synthetic Oil
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