I liked his books, but he was a real car enthusiast.
Every novel had some form of car chase, and often, the hero was in a Stutz, or Packard, or Hispano-Suiza, Delahaye, Aston-Martin, Bentley, or whatever Clive was thinking of that day.
But the thing is - Clive actually owned all of those cars!
He worked at a gas station in his early years, and loved cars. When the money from his novels started rolling in, he started collecting.
His collection is now here:
https://www.cusslermuseum.com/