850i - How much oil consumption is "normal"

I am looking at purchasing an 850i, so I've been trying to learn about common issues with these cars. I am considering one in particular, but it's 2200+ miles away. It's a 6-speed with the color combination I want, but I have some reservations about it. The owner told me that the engine "blew up" when the previous owner had it and that a rebuilt engine was installed. The mileage shown is just under 90K, but if the engine was replaced with a rebuilt one, who knows what the true mileage really is. The owner says that there are no engine leaks, but it burns about a quart between oil changes (appx. 3,000 miles). That raised my eyebrow. I have a Jaguar XJS V-12 and it doesn't burn any oil. Granted, it only has 32K miles.

So, is it "normal" for an 850 to burn oil at this rate?

no, not normal. My 250,000 mile motor doesn't even use that much oil....

Thanks for the reply. I will pass on this one. Too bad, it was a 6-speed manual