Quote:
Originally Posted by MB21
Who told you that you are in break in period?
Real in is something from the past today's engines don it need break in anymore unless you buy something really outdated.
The tolerances on bore and piston form and size are much higher and the measurement of the components is more accurate so parts fit correctly from a day one.
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Straight from BMW.com
https://www.bmw.com/en/automotive-li...a-new-car.html
The right way to break in a new car
Many drivers wonder whether breaking in a new car is still necessary or if this practice has been superseded with the advances in technology. The answer? Yes and no...
Doing an engine break-in used to be a standard procedure with new cars. And it’s still the case that you should avoid running the engine at high RPM for the first 1,300 miles. Experts recommend a maximum 3,500 rpm and 90 mph in diesel models and 4,500 rpm and 100 mph in gas models. This will give the engine and transmission sufficient time to adjust to each other. Once you’ve reached the 1,300-mile mark, you can gradually increase your speed and your engine’s RPM. In particular, avoid to put too much strain on a cold engine. However, that’s true not just when breaking in a new car but for the whole life cycle of your car. Likewise, never turn off an engine that has been running hard. Allow it to cool down by driving a few miles at a gentle pace.
Special guidelines apply to BMW i and M models; those purchasing these models will be provided with the specific details.