Yes,
A good 5,000 mile breakin period is a good number.
I also would recommend (using non-synthetic) changing oil and filter at 100, 2500 and 5000 miles after a fresh motor.
Then go with some synthetic lubes.
I personally change oil and filter after the first run(30 min), then at 100, 1000, 2500, 4000 miles on my freshies. Then I install my synlubes.
I have not, nor have I had any customers with oil consumpions problems.
Even the cars with higher mileage before doing lube changes.
I think alot has to do with breakin procedures, crappy rings, cly wall condition or it wasn`t put together just rite from the get go(ie factory).