Call me crazy but I am kinda in the middle of doing this right now. I have a 2018 Subaru Outback 2.5L that I will probably be trading in (or at least attempting to) before the end of the calendar year. It currently has a Fram Ultra oil filter with just over 12,000 miles of usage. My last oil change used Mobil 1 0w20 EP that consumed a quart of oil after 5000 miles and before 6000 miles so I added a quart of Valvoline 0w20 I had on hand.
Now in typical BITOG fashion I don't want that quart of Valvoline, that I paid $3.25 for, to go to waste. I think I should be able to get to at least 10,000 miles on this OCI before considering a change. But that being said I would still have about 5000 miles of usage left on the Fram Ultra (don't waste that mileage ya'll!) and the likelihood of another quart of oil being consumed by that point is very high. So I COULD just throw in another quart of oil and ride it out...