Do what to car every 30000 miles?

Every 30,000 miles, it's recommended to change the engine oil and oil filter to ensure optimal engine performance. Additionally, you should check and potentially replace the air filter and cabin air filter, inspect the brakes, and rotate the tires to promote even wear. It's also a good idea to check fluid levels, including transmission, coolant, and brake fluids, and top them off as necessary. Always refer to your vehicle's owner manual for specific maintenance guidelines.