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Q: Full Thick oil in my radiator, on 2003 BMW X5

Sometimes I see some oil drop underneath my driveway, last week as I was coming back from work, I started feeling cooled, getting closer to home my tem.garge going towards red.stopped the car to my mechanic, told me it's the oil cooler.all parts changed including service (parts from dealer) got home with the car , the next morning checked my radiator and again oil taking over water.what csn I do, what has gone, how can I solve this problem, why has this gone wrong, please help!
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