Every once in a while while checking the car pricing data I come across something that must be an error, except it isn’t.

I came across such a case when going over the 2009 Mercedes ML350 today. On the ML350 you can get leather upholstery. And you can get a “Heating Package,” which includes heated seats in both rows and a heated steering wheel.

But you can’t get leather and the Heating Package together. Instead, the latter is only available with the standard vinyl seats.