Glad you asked that; I forgot to mention the oil situation. This is it: I started smelling burning oil (from under the hood, rather than in the exhaust) occasionally a couple of months ago, figured I was probably in for a head gasket. Took it to the indy, who said it was actually tranny oil cooler lines. He replaced those, and assured me that there were no oil leaks, which was refreshing.
Thing is, I do still occasionally smell 'that smell' when getting out of the car. Not sure if he neglected to clean up what was left from the cooler lines, whether he was mistaken about what was leaking (seems unlikely, this guy knows these cars well, being a former MB tech), or whether a different leak has cropped up since. The oil and ATF levels don't seem to be falling, and I don't see spots places I've parked (other than home, where there is already a big stain from the leak that was fixed).
the short answer to you question is: i'm not sure. The car is priced below the local competition for just that reason. I'm a law student, and simply don't have the time to get the car somewhere and have it looked over. I'm, of course, delighted for prospective buyers to do so.
Regarding the water pump, I have not replaced it. I haven't owned the car for the bulk of its life, so I can't say that it's original, but I would suggest that anyone considering the car should consider the pump original. that said, it hasn't given any problems. The car doesn't overheat and no noises.
As for options, the car doesn't have any. I think. As I understand it, the options for S320s pretty much consisted of t/c and heated seats. It doesn't have either. Of course, it has everything most cars got as options
. It does have a sunroof, which I have a vague memory was at least a 'delete' option, if not actually optional.
I love the color, too. I bought the car because it was the only one I found that wasn't black. This color's so easy to keep clean, especially right now with the pollen starting.
Sorry for being longwinded.