From a just getting the car to pass point of view, I had the same problem. Fine on everything but HC.
I changed the oil, and it passed. My car eats about a quart and a half every 3000 miles, most of that consumed in the last 1000...
Regarding underlying issues of oil consumption, or other probable causes? I bow to the wisdom of people who actually know about cars.
'88 260E ~200,700 miles
- All stock, except for Blaupunkt "Miami Beach"