What I've heard (i.e. this may just be hearsay) was that for much of its history Saturn used engines that had bores with a fairly rough surface finish which resulted in them holding more oil and reducing wear on the bores and rings but at the cost of burning more oil. Sometimes they burned quite a lot of oil as they got old.

GM treated Saturn like a throwaway brand so they used them for a lot of R&D they didn't want to risk "important brands" over and consequently there's a bunch of random Saturn cars that have features that even some new cars don't have. My friend had one from the early 2000s that would vary radio volume with speed and window position.