yes the 6.0L seems to be a good engine from what I have seen.
But I have seen a neighbors "Caddy" with just over 400K on it. You see it now belongs to a friend of my sons, and he drives it to college runs great. His mom gave it to him it is a 99 Seville SLS with the northstar. His mom said it has been a great car as she drove it for over 12 years as a real estate agent and put many hiway miles on it. She says it has only received normal maintenance like many tires, battieries, brakes, a couple of water pumps, fuel pump, some front-end parts, mufflers etc. I took notice and started asking questions when I saw over 400k on the odo