Valvoline was a brand of motor oil in use on 20th century Earth.
In 1986, at least one San Francisco garbage truck carried a Valvoline sticker. (Star Trek IV: The Voyage Home)
Valvoline was a brand of motor oil in use on 20th century Earth.
In 1986, at least one San Francisco garbage truck carried a Valvoline sticker. (Star Trek IV: The Voyage Home)