Approximately how much oil does the supercharger hold on a Ford Thunderbird?

The Ford Thunderbird, depending on the year and whether it had a supercharger (not standard on all models), didn't have a supercharger oil reservoir *in the same way* as some other supercharged vehicles. The supercharger, if equipped (like on some versions of the supercharged 4.6L V8), used engine oil for lubrication. Therefore, there's no separate "supercharger oil" reservoir to hold a specific amount. The oil capacity is determined by the engine's total oil capacity.