Summit Racing oil

Valvoline 822388 Valvoline VR1 Racing Motor Oil | Summit Racing

10w-30 VR1 since my engine was rebuilt. I don't add anything to it. Run about 500 miles a season and it is a mild 360. Mopar Performance oil filter.
My modern DDs - Acura Amsoil, and Honda Si with performance mods use Mobil1 both 0w-20. I wouldn't use synthetic in a classic/vintage but that's me.