3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
Check the amount of oil in the engine.
It could be a bad oil pump taking its time to develop proper pressure, or a faulty oil pressure sensor. Is the engine noisey when you start it up and progressively quietens down after running for a while?
Another problem that could be a possible issue. I hate to be the one to bring up worse case scenario. Your new engine. Is it new or rebuilt used? And if so a possibiltiy might be to much bearing clearence. Does your oil light flicker from time to time? I don't think your oil sensor might be an issue (But yes please check this to make sure it is working correctly). If the oil sensor is bad sometimes some manufactures will design into the system that the car will not start. A fail safe preventing someone starting and running the car with no oil pressure.
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