What oil for 1963 Ford Thunderbird?

For a 1963 Ford Thunderbird, it's recommended to use a high-quality motor oil with a viscosity of 10W-30 or 10W-40, depending on the climate and driving conditions. If the engine is worn or has higher mileage, you might consider using a thicker oil like 20W-50 for better protection. Additionally, using an oil that meets or exceeds API (American Petroleum Institute) standards of that era, such as SF or SG, is advisable. Always check the owner's manual for specific recommendations.