I certainly wouldn't worry about using 1 quart in 1400 miles or so. I personally wouldn't attempt any repair on my own vehicle if using this amount of oil was the only problem.
On gas engines, consuming oil has the problem of fouling the plugs, if the consumption is too much. This creates a real problem, so you have to resolve the oil burning problem. On diesels, that's not a problem.
I would say to check the oil frequently, use an oil with the diesel rating, change it every 5000 or so, and move on down the road.
You can buy an awful lot of oil for the cost of even the most basic repair.
All of the above,of course, is only my opinion. I know this subject can be rather controversial.