Well, have you done a leak down test or compression test?
That would give you a very good idea of how much blow-bye your rings are costing you. Maybe you have excessive oil leaking down thru the Valve guides. In any case with that much oil consumption one would think a certain amount of blue smoke would be noticeable; at startup in particular where everything is cold and the rings and pistons have not had a chance to expand and close some of the gaps, so when you fire up the motor in the morning you would see the smoke……..and when you really lay into it.
Anyway, getting back to your question about additives, that is a crap shoot really, because the only thing that can keep MOVING PARTS from allowing oil to slip by is something that would increase the 'Weight' of the oil so as to make it thicker and that is really a waste of money since the same effect can be gathered by going to a much thicker oil. It may even benefit you to run straight 30W oil, unless you live way up north where a cold morning would be hard on the oil pump. So the answer to your question is to look at maybe going with a 20w-50 oil until the new motor is ready.
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