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You should not need any DEF initially as it is covered in the 4 years maintenance. Here in Atlanta, it is available at many place: Wal Mart, NAPA, Advance, Autozone, service stations, BMW Mercedes VW dealers, etc.
At Wal Mart it is $11 for 2.5 gals it I remember correctly. The most expensive place to buy it is at the BMW dealer!
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