Purchasing used ford engines can help you restart your vehicle without having to pay as much for auto repairs. However, you might be in a worse situation than before if you buy a used engine from a subpar salvage yard or buy any old engine off Craigslist. It is never 100% certain that everything is fine even with a service history because there might have been a problem since the last service. If the engine has a problem and needs to be replaced, you might have to pay for the labour to install it.