Years ago, after reading all the problems from sticky/broken ignition switch/key issues and starting to experience some problems with ours, I ordered new keys. That solved the problem before it became dire. However, I also installed aftermarket keyless entry (with alarm), and that has prevented excessive wear from deteriorating the new set of keys, since the ignition is now their only task. Save your keys and locks and do the same, if you have a model like ours that did not have this feature.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7