The frequency of oil changes for a car depends on several factors including the type of oil used, driving conditions, and the manufacturer's recommendations. However, a common rule of thumb is to change the oil every 5,000 to 7,500 miles (8,000 to 12,000 kilometers) for conventional oil and every 7,500 to 10,000 miles (12,000 to 16,000 kilometers) for synthetic oil.
However, it's always best to consult your car's owner's manual for specific guidelines tailored to your vehicle. Some newer cars have advanced engine designs and synthetic oils that can extend the time between oil changes. Additionally, if you frequently engage in severe driving conditions such as towing heavy loads, driving in extreme temperatures, or frequently stop-and-go city driving, you may need to change your oil more frequently.