Change your oil every 3000 miles, the brakes need to be changed if they squeal or make weird noises, trust your mechanic, buy a used rental car . There are many falacies out … Get a second opinion from a friend who knows car , call Car Talk on AM radio, google search your problem, and listen to your car with the windows down on your way home and really listen for strange sounds or if the car drives/feels different than it did a month ago.