I know absolutely nothing about cars. Our dealer says that we should bring our car in for a tune-up (more than just an oil change) every 7500 miles, and a major tune-up after 30000 miles. The 30000 mile check-up includes changing all the fluids, checking everything, rotating the tires, etc. It costs around $350. Are they ripping us off? Do we really need all this maintenance? I want to keep my car in great shape, but I don't want to waste money on unnecessary check ups. I get the oil changed every 4000 miles, and so far, have taken the car in for its 7500 mile tune-ups. My 30k is coming up soon.