Sorry, I meant to disclaim being an expert. I am NO expert. But I can't imagine anyone proclaiming 1 Quart in 8,000 miles as excessive oil consumption, regardless of occupation.
There are many diesel owners who are pleased with using 1 Quart in 2,000 miles.
Again I apologize for the implication of being a self proclaimed expert. But please be happy with your oil consumption, or lack thereof.
Good luck and Merry Christmas,