Steve drove a Mercur
It could have been white with red interior, convertible.
In 1989, I saw Steve driving a Mercury Merkur, the German version of the Mercury.
I think it was Karen's (his wife's) car.
I had never seen one before, so he gave me a test drive around the block in Elizabeth, near WestEnd Billiards.
Only 800 Merkurs were ever sold in the USA, so I guess it's somewhat of a collector's car.