Tune Up refers to service and maintenance on your car. In the past, cars literally needed "tuning" to recalibrate settings. Newer cars of today have different systems, some that self adjust. Despite all that, you car’s oil still needs to be changed regularly, fluids need to be topped off, brakes need to be inspected, and tires need to be rotated. There are also many hoses and belts that should be regularly examined for wear to prevent more serious maintenance issues.