The 1995 Ford Thunderbird can use 5W-20 and 5W-30 for all temperature but 5W-20 is the preferred recommendation.
Unlike today, vehicle choices were pretty limited 50 years ago when the Ford Thunderbird first took flight. There were sedans, coupes, station wagons and convertibles, but essentially a Ford was a Ford -- straightforward variations on a common design.
With the 1955 T-bird, however, Ford introduced the notion of a sporty "personal luxury car" -- a close-coupled two-seater with V8 power, a cushy ride and elegant styling. It also had the simple construction and reasonable price of a Ford.
If you want to own and properly maintain a vehicle, at some point you'll have to figure out what kind of oil your car takes. Whether you're at a service centre being asked what kind of oil you want or at a parts store shopping for oil to top off the engine, you'll want to know what's recommended. Check out some tips on choosing the right engine oil at Cars.com.