Newer cars use 5w 30. However your vehicle uses a turbo charger which is very hard on oil, temp wise. I would use a synthetic 5w-30 oil. A little extra money now is better than alot of money later to repair the engine! I have a c230 and that is what i use. Mobil-1 or castrol syntec every 3000 miles.
Mobil 1 0W-40
The final year for the Mercedes C320 was 2005. For 2005 year C320 the recommended engine oil are synthetic 5W30 for year round use. 0W30 meets all specifications for this grade also.
5w-40 Mobil 1 synthetic
what oil do i use when i change my oil in my 1995 Mercedes Benz c280
what oil do you put in a 2002 311 Sprinter Motorhome Mercedes
All Mercedes Benz vehicles after model year 2005 can use 229.5 or 229.51 oils. Starting with model year 2007 Mercedes Benz diesel engines must use only 229.51 approved engine oil.
Mercedes recommends that each of their vehicles use a certain synthetic oil. The ML350 is recommended to use 5w 30 synthetic oil only.
synthetic oil
The 2005 Mercedes-Benz E-Class runs on diesel fuel.
What type of motor oil does a Mercedes 230C 2006 take
The 2005 Mercedes-Benz SL-Class runs on premium unleaded (required).
The 2005 Mercedes-Benz SLK-Class runs on premium unleaded (required).