Service contracts are sold as relief. Relief from what is the question most buyers never answer. Before you talk about term or cost, sort your situation into one of three problems. The first is a cash problem: you could not pay a surprise repair bill within a week without borrowing. The second is a timing problem: your car is near the end of its factory coverage, and a major repair is more likely to land while you are still driving it. The third is a worry problem: you feel uneasy about the car but have no record of a specific failure. Each one points to a different answer, and only some of them call for a service contract.
Test the cash problem
Write down what you could pay for an unexpected repair in the next week without selling anything or borrowing. Be honest about it. If you could cover a bad week but not a bad month, a contract may spread the risk, but it will not make a large repair affordable on its own, because you may still owe a deductible or a share of the bill under the contract. Ask the seller to show you the cost-sharing section in the text, and work through the numbers using your own figures, not the seller's.
Test the timing problem
Look at the factory warranty dates and mileage limits on your car. Ask whether a contract starts when the factory coverage ends or overlaps it. Then check the waiting period, which is the stretch after purchase when a claim may not yet be accepted. A contract that starts late does nothing for a failure that happens next month. This site sorts the field by waiting period in its vehicle service contract companies by waiting period, shortest first list, so you can see the gap for yourself.
Test the worry problem
If you have no record of failure and no cash gap, the feeling of unease is worth naming rather than paying to quiet. Pull up your own repair history, your maintenance log, and any warning lights you have seen. If none of it points at a specific part, the contract is buying peace of mind. That can be a legitimate purchase, but only if you know you are making it. Write that sentence down before the signing appointment.
Say which problem you have
A contract that fits a cash problem looks different from one that fits a timing problem, and both differ from a worry purchase. Name the problem in one plain sentence, then check whether the contract's terms address that sentence. If they do not, the contract is solving a different problem than the one you have, and you should say so to the seller before you sign.