I change mine every 4K miles, 'cause I like to, not 'cause I need to, and it will consume 1-1/2 qts.
There are too many 5. 9's here at school to count... ... . they all consume oil. They run 10K to 16K miles between changes. The ISB's blow oil out the crankcase vents, enough to undercoat the bus. Mine will not.
-S