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A variety pack of candy and a card would be a nice gesture, but there are many other gifts that would be more appropriate for a mechanic. Some ideas include a tool set, a gift card to a local automotive supply store, or a personalized mechanic's shirt or hat. You could also consider giving them a gift certificate for a car wash or detailing service, or a gift basket with automotive-themed items such as oil, brake fluid, and tire pressure gauges. Overall, the most important thing is to show your appreciation and gratitude for their service.