What engine oil for 1978 corvette?

For a 1978 Corvette, it's generally recommended to use a high-quality 10W-30 or 10W-40 conventional or synthetic oil, depending on the climate and driving conditions. If the engine has been rebuilt or modified, you might consider using a higher viscosity oil for added protection. Always check the owner’s manual for specific recommendations and consider using oils that meet or exceed API standards from that era.