Are trivia questions off topic?
I wouldn't call them trivia questions. When I saw the question in question I came to meta to make a case for having that question be on topic.
They are good for the Q&A format we have here, it's useful information that would bring traffic here.
I think question like the BMW cruise control as well as the following questions should be on topic
Did the 1954 Chevrolet Truck 6 cyl 235 ci come with an oil filter from the factory?
Did all 1955 Chevrolet Bel Air have positive traction, or was it an option?
Paulster2 Could answer most F-Body questions like this off the top of his head and Bob Cross and Roy Alsop could answer most Subaru questions like this of the top of theirs. Who am I kidding Bob Cross could answer ALL the questions of the top of his head with a BCWOW.
While these questions might seem trivial I think they would provide a good resource for future visitors.
Of course that's just my opinion, I could be wrong.