Can i use 20w-50 in my 98 Buick century custom?

Yes, you can use 20W-50 oil in your 1998 Buick Century Custom, especially if the engine has high mileage or is experiencing wear. However, it's important to check the owner's manual for the manufacturer's recommended oil viscosity, as they typically suggest a different grade for optimal performance. If you live in a warmer climate or if the engine shows signs of oil consumption, 20W-50 may be beneficial. Always ensure to monitor oil levels and engine performance after changing oil grades.