Westend61/Getty Images Dealerships will offer prepaid car maintenance plans alongside other extras like extended warranties, credit insurance and anti-theft devices. They are not necessarily a bad deal. But the best way to decide if a prepaid maintenance plan is the right choice is to research expected maintenance costs — then compare these with the price you’re offered. If you plan to add the prepaid maintenance plan to your auto loan, it may make more sense to instead keep a savings account for expected maintenance costs where you earn, rather than pay, interest. What is a prepaid car maintenance plan? Prepaid car maintenance plans are contracts that cover scheduled and expected…