DO NOT BUY 'AFTERMARKET' WARRANTIES, chances are you will pay way more and will cover less. If you purchased a warranty from the dealer when you bought the car and is running out, if you feel better having the warranty then renew it with them. It is a 'double edge' sword when it comes to warranties, meaning you could as suggested, once the original one runs out, you could put that extra money aside each month, BUT...if 3 months from now a major repair needs to be done, that is the chance you take. My advice, if car repair could be a strain on your budget, then try to negotiate a renewed contract with the dealer. that would be the safest bet.