When you hear the term "well-oiled," you might think of a machine that operates smoothly and efficiently. However, there are plenty of other words that can be used to convey this same idea. Consider terms like "polished," "streamlined," or "slick." These words all suggest something that has been carefully prepared and is operating at peak performance. Other options might include "well-tuned," "well-maintained," or "finely-tuned." Each of these synonyms has its own subtle connotations, but they all suggest something that is in good working order. Whether you're describing a machine, a team, or a process, these words can help you convey the idea of something that is perfectly functioning and well-prepared.