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I'm having the same issue on my 2014 F30 335d.
As soon as I bought the car, I rebuilt the entire engine, including servicing the turbos, just to be sure that my car will last a long time.
I also did a DPF off, EGR off, muffler delete, and the mechanic mapped an "Alpina D3 Japan" soft. The car is sitting at 350-360hp right now, and it drinks about 1L/4k km of oil.
I unpluged the downpipe with the car running, and I saw a little bit of oil coming down from the turbos.
The car never had blue/white smoke from the exhaust (only black smoke if I rev it and it's cold, which I think it's normal, considering the DPF off)
So if the entire engine has been rebuild.. what could be the issue here? The mechanic said we should open up the engine again, to take a look.. but maybe can it be a problem with the mapping?..
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