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The 2015 Mercedes-Benz C-Class holds 7.4 quarts with the filter installed and is compatible with various oil types. By default, it typically comes with 5W-40, but depending on the temperature in your area, you may need to adjust it for optimal performance. In cold conditions, below freezing, consider using 0W-30 to 0W-40. If it stays above -13 degrees Fahrenheit, stick with 5W-30 or opt for 5W-40 or 5W-50 for better performance. In warmer climates where it rarely freezes, you can use up to 20W-50 or any viscosity in between. Choosing a thinner viscosity oil will provide better lubrication.
A 2015 Mercedes-Benz C-Class requires 7 quarts of oil with a new filter. Mercedes recommends using a synthetic SAE 5W-40 engine oil.