(My Opinion) Synthetics work best...especially if you have the Ford 2.3 Liter Turbo Motor. Synthetics work much better in extreme environments (hot and cold). Turbos all work off the engine's exhaust gasses. They're always exposed to extreme heat. Synthetic oils do not burn as readily as traditional oils, therefore don't lease burn remnants or residues on bearings or shafts, due to extreme heat. This makes engine and turbo gaskets and bearings last longer that traditional oils. The down side, synthetic oils are (usually) much more expensive than traditional oils.
10w30
10w40 any brand you prefer. Rotella T is very good.
5W-30 is the preferred oil , according to the 1996 Ford Thunderbird Owner Guide
95 thunderbird 4.6 auto transmission
Either at the rear or side of the oil pan.
What engine do you have?
Thunderbird
if it's not the right kind, then YES. I'm pretty sure a 87 Bird takes 10W30
No, it has one oil drain plug.
Supercharger oil for a 1993 Ford Thunderbird can be found at auto parts stores that sell racing performance parts. Usually, a 50 wt. oil will work for this type of engine.
Thunderbird
Either at the rear or side of the oil pan