The correct weight is listed in your owners manual and possibly of the oil fill cap. The brand you use is your choice. I would recommend 100% Synthetic (any major brand) for this car.
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What type of motor oil does a Mercedes 230C 2006 take
The 2011 Mercedes-Benz Sprinter has double overhead cam (DOHC).
The 2011 Mercedes-Benz GLK-Class has double overhead cam (DOHC).
The 2011 Mercedes-Benz CL-Class has double overhead cam (DOHC).
The 2011 Mercedes-Benz E-Class has double overhead cam (DOHC).
The 2011 Mercedes-Benz S-Class has double overhead cam (DOHC).
The 2011 Mercedes-Benz GL-Class has double overhead cam (DOHC).
The 2011 Mercedes-Benz C-Class has double overhead cam (DOHC).
The 2011 Mercedes-Benz CLS-Class has double overhead cam (DOHC).
The 2011 Mercedes-Benz M-Class has double overhead cam (DOHC).
The 2011 Mercedes-Benz SLK-Class has double overhead cam (DOHC).