What type of oil does a Buick regal 2002 use?

The 2002 Buick Regal's recommended oil type depends on the engine it has. There were a few different engines offered that year. To know for sure, you need to check your owner's manual.

However, generally speaking, a 2002 Buick Regal likely uses 5W-30 oil. This is a common viscosity for many vehicles of that era. But again, consult your owner's manual to confirm the exact type and specifications (including API certification) recommended by Buick for your specific engine.