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Astro14 08-27-2016 10:03 PM

Breaking an engine in is absolutely required on a rebuild or a new engine. Mercedes has specific break in instructions, listed in the owner's manual. Breaking in is not obsolete.

However, the use of a "break in" oil is not required and many high performance cars come from the factory with synthetic oil.

The idea that a synthetic will prevent break in is an old wive's tale.


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