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Check the oil feed line to oil filter housing say 8" hose couple banjo fittings very common pretty simple job as well. Part avail. at bmw should be in stock.
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Ok, based off what I read above, you have a 05 545i with an oil cooler. This should be a N62 motor. I have the same vehicle except mine is a 550 and what you are describing is the oil cooler housing seal. This seal is extremely difficult to see because it is located behind the oil cooler lines and the left motor mount. It is an oring sort of in the shape of the letter "T". This is a difficult job to perform at home for the weekend mechanic but possible. The motor has to be raised slightly so the left motor mount can be completely removed and the bracket that is bolted to the motor can also be removed, but the power steering pump has to be moved out of the way and really the best way to see all of this is on a lift. At the dealership I could do it in 3 hours with 40 to 50 replacements under my belt. Most of the other guys in the shop would take 8 to 10 hours to get the job done. You will need to seal and the o-rings to the oil cooler hoses and make sure that you do not bent the lines or they will not seal. These oil leaks would come in all the time for exactly the reason you are stating, the customer would say I have a large oil leak but can not pin point it on the left side of the engine. Other than that seal, the upper timing case cover and the valve cover there is no other place for an oil leak!
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Ok with the information you gave me about a shop, this is a job that I do mostly under the vehicle. The seal is actually on the motor mount that is bolted to the block! This is why it is so hard to see where it is coming from. What I do is to unbolt the motor mount 15 mm nut from the top and then go up with the vehicle. From under the vehicle I move everything that is in the way and completely remove the motor mount from the vehicle from the front of the engine bay. I say this because all those items have to be out of the way to remove the mount bolted to the block. The power steering pump can be unbolted and pushed off to the side, because if the fluid is drained you will need to do a suspension calibration. There is many torx bolts but none of them need replacing. When I get to the point of the mount removal I use a screw jack with a block of wood and raise the motor and since the right side is still bolted in the left side will raise at the angle you need to remove the mount, the remove the bolts that hold the mount to the block and remove the mount. When you look at the surface up against the block you will see the oil passage on the block and the seal on the mount. The power steering hoses that are bolted to the mount are a little difficult to remove(unbolt) but you can do it, try not to bend it to much or reassembly will be very difficult and the lines can also be moved out of the way.