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unless you're leasing, don't go by bmw's service recommendations. the differential oil, power steering fluid, etc are lifetime fills, which means bmw will not pay for those. my indy bmw shop was appalled at how filthy my power steering fluid was at 40k miles or so. change your trasmission fluid before 40k miles, as well. additonally, i do oil changes every 5-7k miles now, after they showed me the oil after 10k miles (less than 10 months old).
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