Do not hang anything heavy on your car key (or key chain) and do not hang a dozen other keys on it. The weight (combined with bouncing while you drive), can wear out the tumblers inside the ignition. This leads to ignition switch failure over time.

Drive with only the ignition key in your ignition or purchase a key chain that allows you to separate your car key from the others. This will add years of service to your ignition switch. If your ignition key “sticks” when you try to start your engine, your ignition switch may be on its way to failure.

Therefore lighten up your car key & key chain before further wear and tear sets into your ignition switch.

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Tumblers Inside The Ignition