Per Mike's request, here is my rusty old tin of MGH-8:
Yes, the wax is still good (and has the distinct M08 scent).
Old MGH-8 and today's M08:
MGH-8 was released in 1950 as Meguiar's first paste wax. The interesting part about this product is that it has the directions for use on your car. Now, MGH-8 is known as M08 Mold Release Wax and does not mention using it on your car. Funny how things change!