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So how long do you plan on keeping the car is the first question to ask. Second the diff oil service is 100,000 miles per BMW maintenance requirements. Powersteering fluid change is not a recommended service interval, but several of us (including me at 158,000 miles) have done it. The fuel induction cleaning is also not a BMW recommended service interval and probably is not necessary on an N52. All of these are easily handled at an independent shop. However, keep in mind you'll never be able to tell the fluids and cleaning were actually done...
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