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I always use Motul 20w/40. It is not synthetic, and change it every 7500 km.
The 2004 Mercedes-Benz C-Class has a 6-speed manual.
The 2004 Mercedes-Benz SLK-Class has a 6-speed manual.
The 2004 Mercedes-Benz SL-Class has a 7-speed shiftable automatic.
The 2004 Mercedes-Benz CL-Class has a 7-speed shiftable automatic.
The 2004 Mercedes-Benz M-Class has a 5-speed shiftable automatic.
The 2004 Mercedes-Benz E-Class has a 5-speed shiftable automatic.
The 2004 Mercedes-Benz G-Class has a 5-speed shiftable automatic.
The 2004 Mercedes-Benz S-Class has a 7-speed shiftable automatic.
The 2004 Mercedes-Benz M-Class runs on premium unleaded (required).
The 2004 Mercedes-Benz SL-Class runs on premium unleaded (required).
The 2004 Mercedes-Benz G-Class runs on premium unleaded (required).