What type of oil to use for 2001 grand prix with 108000?

For a 2001 Pontiac Grand Prix with 108,000 miles, you should use 5W-30 conventional motor oil unless your owner's manual specifies otherwise. Always check your owner's manual first, as it will have the manufacturer's recommended oil type and viscosity.

While synthetic oil offers benefits, conventional 5W-30 is perfectly suitable for this vehicle's age and mileage, and is generally more cost-effective. If you want to use synthetic blend or full synthetic, that's fine too, but it's not strictly necessary. Just ensure it meets the specifications listed in your owner's manual. Pay close attention to any API certifications mentioned.