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The 2012 Buick Regal GS was only available with a 2.0L 4-Cylinder LHU Flex Turbo engine, and no other engine options were offered. This engine requires full synthetic 5W-30 motor oil and can hold 6.3 US quarts including the filter. To fill it completely, you'll need a one and a half gallon container of oil. The oil drain plug has a 13mm head size and needs to be removed with 22 ft-lbs of torque.
The Buick Regal GS from 2012 requires fully synthetic motor oil with a viscosity grade of SAE 5W-30.