Hi, Thanks for all the information and your feedback. I have actually narrowed my search down to a few vehicles such as this one....2012 X5 50i with 140,000km (87,000 miles). The price is around $17000 Cdn or $13500 USD. Owned by a GM mechanic (yes...he collects BMWs!) and I talked to him regarding maintenance and oil consumption. He said honestly that you really do need to add quart at about 1600-2000km (depending on driving style), so probably about 2 quarts between oil changes.
He said he checked with BMW and they said that is normal for this engine. He said he could do the engine warm up and rev test with me to show me it’s not blowing out blue smoke.

However, this is unfamiliar territory for me as I usually avoid oil burning engines. However, after driving a 50i...it feels and sounds like a sports car but at the same time...can get you through the ice & snow during the winter. So even though common sense is telling me this engine could be trouble...I am intrigued.

I have even been thinking....if the oil consumption gets a lot worse.....could I actually do the valve stem seals myself if I’m not a journeyman mechanic? I searched the sites and found some good instructions.

Another dumb question....Is there an oil or additive that might slow the consumption?

Thanks