I don't think you can compare a car with a watch (let alone the priority needs and reasons for the latter). But in answer to your question, I'd always have a car serviced regularly to help pre-empt and miniiice the risk of a breakdown, help prolong its life and performance and especially to ensure it's safe and roadworthy etc. Not quite the same for a watch that isn't going to be a safety risk to anyone whether it's serviced or not.
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