I would look under the hood and see if it tells me anything give these websites www.allldatadiy.com and www.autozone.com also call your local GM-dealership in the part department if you have misplace your owner manual give this website a try to see if you can download its www.edmunds.com wish you the best of luck Michigan Man.
Depends on what your mileage is, also look on the topo of your oil cap or in the owners manuel. Chances are though that it'll be 5W-30
3.1 liter engine Use 5W30
Capacity is 4.3 liters with oil filter changed.
3.4 liter engine Use 5W30
Capacity is 5.2 liters with oil filter changed.
Good luck and how this helps.
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