>The second engine had 40k miles when it was put in and yes it burned a
>quart every 2-3k miles. AFAIK, all older unmodified Saturns with the
>1.9L burn oil.

As far as you know; is wrong. Not all burn oil.

>I have no evidence that it will STOP burning oil, only that it will
>help greatly reduce the oil burning. I had noticed that the oil
>burning tends to get worse when the oil is dirtier. This makes sense
>to me because the carbon, or soot, deposited in the oil tends to
>absorb heat. When this happens the oil gets hotter and is more prone
>to flashing near the piston rings. Several mechanics (I don't know
>their names) that have posted on the internet say that a few of the
>major problems with the 1.9L are the piston rings tend to get stuck
>and also a few problems with valve seals, and sludge around the timing
>belt.
>

You have no evidence that it will stop it, because it won't. By the way, when
my engine was on its slow descent to its final oil consumption rate of a qt/250
mi before I rebuilt it, it didn't matter how dirty the oil was. It sucked oil,
clean or dry. They tend to do that when the oil control ring is frozen.