Chiming in, on that note... I've had trouble checking oil level of the '04 OBS. Obviously has one of those difficult to read dipsticks, as others here have already pointed out.
I hadn't looked at the actual tube itself, down by the oil pan, before. I see now how it does bend and go in at an angle. The stick also has a notch out, above the Full mark. I probably should look into this, but I'd guess it is an overfill or hot oil mark. With the angling I'm thinking maybe it wouldn't be too big a difference in levels between the low, full, and overfilled (hot) marks, yet apparently about a quart from low to full like most dipsticks I knew of in the past.
After changing my original (new car) oil out at 1442 miles with Mobil1 I noticed I might have gone over the Full mark by a little bit. Drained half quart out and it looks like it is at or below full, just that the oil on the stick is very different on both sides. So I was glad to read about the troubles with that here and maybe there's a better way to check it. I added 4.25 quarts (filter changed too), approximately, judging by the 5 quart jug's visible level gauge. OM calls for only 4.2 Qts, so it's conceivable there was some oil left behind during the drain. It's just very difficult to tell what the dipstick is telling me, would be nice if the manual told how much to add when it shows to be right at low.
Anyway, I'll run it a while with mine somewhere between low and full until I can figure out where Full really is.