Oh - oil consumption and oil level warning. Those werer the days
Boy do I have some stories and experiences fo you...

But - suffice to say, you are at least 1 quart down when the message comes on.. but in my experience over a number of low oil conditions - no let me rephrase - that a huge number of low oil level conditions, it seems the oil level idicator is not an instantaneous indicator (although I would have thought it should be).
The oil level indicator seems to wait for the next power cycle to tell you.
So in my case, with a car that used to drink a quart every 500 miles, a long trip might have me almost 1.5 quarts or more down by the time the warning comes on.
Either way - by the time your DIC is flashing "Low Oil" - you have Low Oil
