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Break in is necessary, my 135i, I did a burn out after I left the dealer and did not brake it in, because it was a lease - and that car burned a lot of oil during its tenure. A quart every 2,000 miles.
My 235i I did brake in properly and this car does not burn a drop of oil.
They are both the same N55 motor.
This leads me to believe there is some truth to brake-ins...
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