Thanks for all your replies so far. I took the car to 5 local bmw only mechanics and all told me that it is fixable it just depends how much you willing to spend $$$. 3 mechanics said that I will be better off finding a used nice engine and it might come out cheaper at the end and better for car. I been quoted on the repair 2-5k and the engine I found is $6500 with 25k miles. Should I do the repair to my 85k engine or buy the used one and swap it? what you all think?