What type of oil do you put in a 1970 Buick Electra 225?

For a 1970 Buick Electra 225, it's recommended to use 10W-30 or 10W-40 motor oil, especially if the vehicle is driven in varied temperature conditions. Additionally, high-mileage oil can be beneficial if the engine has significant wear. Always refer to the owner's manual for specific recommendations based on engine condition and usage.