Instead of paying a monthly premium for a service agreement, put that money in your savings account. Warranties and service contracts are insurance in case someone bad happens. But you are still spending money each month even if nothing happens to your vehicle. So knowing when to get a warranty depends on the condition of your vehicle and other key factors.
You may not have to worry about paying for repairs for a long time if your vehicle is new or newish, as long as you take care of your vehicle. Likewise, any factory flaws should have shown up if you have driven your care for a while and know it is reliable.
Look into your car insurance coverage. A service agreement might overlap cover with your car insurance. You may already be paying for the coverage you are seeking.
Some factory defects will always be free of charge whether you have a warranty or not.
Manufacturers must inform consumers if there is a safety concern. They often send a postcard or letter in the mail about a manufacturer recall in addition to a public announcement.
The written notice will tell you where to take your vehicle to have the hazardous part or system replaced. Because it is a safety issue, the manufacturer must cover the flaw on all their vehicles with the problem.
Be wary of phone calls claiming a recall or warranty on your vehicle. When there is a known recall, scammers might call vehicle owners and ask for a payment to change the defective product. Likewise, a caller might claim you are eligible for an extended warranty but tell you there is a fee for signing up.