1994 Buick Skylark Owner's Manual - Page 216
1994 Buick Skylark Manual
Page 216 highlights
been certifiedby the American Petroleum Institute (MI), and is preferred foruse in your gasoline engine. You should look for this on the front the of -oilcontainer, and use .only oils that display this new symbol. You shouldalso usethe proper viscosity oilfor your in vehicle, as shown the following chart:
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