In addition to performing routine maintenance tasks, like taking care of an oil change and making sure your cooling system is in order, your mechanic can check and fix bigger issues you may or may not be aware of. There may be timing belt issues, head gasket problems, or other engine troubles that can lead to everything from sluggish acceleration (not a good thing when you’re driving on the freeway) to a decrease in fuel efficiency. Your mechanic can check all systems to see what repairs should (or must) be taken care of before you leave for your big trip.