Pontiac 1993 Grand Am Owner's Manual page 212

SAE 5W-30 (2.3L Quad OHC and
Quad
4 Engines)
As shown
in
the viscosity chart,
SAE 5W-30 is best for your vehicle.
However, you can use SAE 1OW-30 if
it's going to be 0°F (-18°C) or above.
These numbers on an oil container
show its viscosity, or thickness.
Do not use other viscosity oils such as
SAE 1OW-40 or SAE 20W-50.
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