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When I picked up my 128i in Germany I followed BMW break-in procedures fairly strict. I also got to drive my car for an extended period of time ranging speeds from 10mph to 100mph and engine rpms 1,500-4,000 for the first couple hundred miles. Got 93k miles on the engine now and I have never added a drop of oil between changes with the longest change interval at 18,000 miles. I know I know I am a terrible car person but I did send Blackstone Labs an oil sample and they said the oil was still good to run on. However I think the overly used oil was starting to cause the electronic dipstick to give bad readings. Lastly to this day my engine feels and sounds like the day I got it from the factory.
I think a good engine break-in will go a long way.
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