Date registered: May 2011
Vehicle: 2005 S600
Location: Virginia Beach
Mentioned: 13 Post(s)
Quoted: 53 Post(s)
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.
2016 Tundra 1794
2005 MB S600 (100K, Michelin AS3+, M1 0W40)
2002 V70-XC (228K Castrol 0W40)
2002 V70-T5 (198K, Mobil 1 0W40)
1932 Packard Sedan (straight 8, dual sidemount spares, original paint and interior, Shell Rotella 15W40)