had the same problems
the same minimum oil level warning came on for me about twice and ive had my e90 for about 6 months. concered, i took it to the dealer and he said that a few of the e90's had a problem with a oil pressure sensor which was giving a faulty readout, so he took the car for about 3 hours and had that sensor replaced. im not sure if this is eactly whats happening in your car but the symptoms sound the same
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2006 325i SG ED 8/7/2005
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