Oldsmobile 1995 Silhouette Owner's Manual page 262

Your vehicle has an air bag system. Before attempting to
do your own service work, see "Servicing Your Air
Bag-Equipped Oldsmobile" in the Index.
You should keep a record with all parts receipts and list
the mileage and the date of any service work you
perform. See "Maintenance Record" in the Index.
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NOTICE:
If you try to do your own service work without
knowing enough about it, your vehicle could be
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damaged.
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Fuel
Use regular unleaded gasoline rated at 87 octane or
higher. It should meet specifications ASTM D4814 in
the United States and CGSB 3.5-92 in Canada. These
fuels should have the proper additives, so you should not
have to add anything to the fuel.
In the United States and Canada, it's easy to be sure you
get the right kind of gasoline (unleaded). You'll see
UNLEADED right on the pump. And only unleaded
nozzles will fit into your vehicle's filler neck.
Be sure the posted octane is at least 87, If the octane is
less than 87, you may get a heavy knocking noise when
you drive. If it's bad enough, it can damage your engine.
If you're using fuel rated at 87 octane or higher and you
still hear heavy knocking, your engine needs service.
But don't worry if you hear a little pinging noise when
you're accelerating or driving up a hill. That's normal,
and you don't have to buy a higher octane fuel to get rid
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