Oldsmobile 1998 Aurora Owner's Manual page 69

The ignition keys are for
the ignition only.
The door Keys are for the
doors and all other locks.
When a new vehicle is delivered, the retailer removes
the plugs from the keys and gives them to the first
owner. However, the ignition key may not have
a
plug. If the ignition key doesn't have a plug, there
will be a bar-coded key tag instead.
Each plug or tag has a code on it that tells your retailer
or a qualified locksmith how to make extra keys. Keep
the plugs or tags in a safe place.. If you lose your keys,
you'll be able to have new ones made easily using these
plugs or tags. If your ignition keys don't have plugs or
tags, go to your retailer for the correct key code if you
need a new ignition key.
NOTICE:
Your vehicle has a number of features that can
help prevent theft. But you can have a lot of
trouble getting into your vehicle if you ever
lock your keys inside. You may even have to
damage your vehicle to get in. So be sure you
have extra keys.