We seem to need to carry several keys on our key ring…for the house, work, parents homes, garage or other cars but having a heavy key chain can damage your starter. The weight of the key chain can wear out parts of the ignition called tumblers. A worn tumbler will no longer be able to engage and turn the ignition lock. The recommendation is to have 1-2 keys including your key-fab. If you need to have more than the recommended keys then put the additional keys on another key ring to keep in your car for easy access.