Use Oil that meets 229.5 specifications, my preference is Mobil 1 0W-40 European Car Formula fully synthetic. There is also castrol syntec 0w30 aka german castrol. mobil1 0w40 can be found at almost any autoparts store or Walmart, whereas castrol syntec 0w30 can be found at autozone. (courtesy of mbworld.org)
The 2003 Mercedes-Benz S-Class has a V8 engine.
The 2003 Mercedes-Benz SL-Class has a V8 engine.
The 2003 Mercedes-Benz CL-Class has a V8 engine.
The 2003 Mercedes-Benz M-Class has a V6 engine.
The 2003 Mercedes-Benz G-Class has a V8 engine.
The 2003 Mercedes-Benz E-Class has a V6 engine.
The 2003 Mercedes-Benz SLK-Class has an inline 4 engine.
The 2003 Mercedes-Benz C-Class has an inline 4 engine.
The 2003 Mercedes-Benz M-Class has an engine horsepower of 215.
The 2003 Mercedes-Benz S-Class has a 4.3 L base engine size.
The 2003 Mercedes-Benz E-Class has a 3.2 L base engine size.
The 2003 Mercedes-Benz M-Class has a 3.2 L base engine size.