front and rear tire pressure settings on 2008 Buick Lucerne

I have a 2008 Buick Lucerne CXS wuth Factory 18" wheels. What is the proper air pressure settings for the tires on these bigger tires? TIM

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1 answer
Here is a PDF file link to the owners manual for your car.
http://www.buick.com/assets/en/pdf/owners/manuals/2008/Buick_Lucerne_OM_2008.pdf
Page 5-67 talks about tires
Page 4-20 show tire decal location on your car
It seems to imply you must follow the pressures recommend on the decal on your car.