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I've done 15k oil changes in my past BMWs: 1993 325i(152k miles), 2002 325i(84k miles) and even my 2002 M3(82k miles)(sorry i have 2 mortgages). They still ran like champs without any problems. And now we bought the 135i, we just did the break in oil service at 1800 miles and plan on doing it at 15k miles.
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