How much is my 2000 murcary sable worth? it has the 3 liter DOHC. with a 109056 miles on it?

The mileage hurts, but you ought to get something like $3500 from a private sale; as a trade-in from a dealer, of course, less. These were great cars -- why not keep it till something expensive goes wrong? I made a mistake in trading in my 96 Taurus (the same thing) just because it was approaching 100,000 miles.