Does your car key share a chain with a dozen or more other keys? 
That’s a pretty heavy load hanging off the car key when it’s in the 
ignition.The weight, combined with bouncing while you drive, can wear 
out the tumblers inside the ignition and eventually lead to ignition 
switch failure. To add years of service to your ignition switch, purchase
 a lightweight key chain that allows you to separate your ignition key 
from the others. Drive with only the ignition key in your ignition. If 
your ignition key “sticks” when you try to turn on the car, it’s a 
warning that your ignition switch is about to fail. Replace it before 
you get stranded.

 
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