Where do you add oil on a 2002 Mercedes Benz c230?

To add oil to a 2002 Mercedes-Benz C230, open the hood and locate the oil filler cap, which is typically marked with an oil can symbol. Remove the cap and pour the appropriate engine oil into the opening, using a funnel to avoid spills. After adding oil, check the dipstick to ensure the oil level is within the recommended range. Replace the oil cap securely after finishing.