If its got a 2.7 run away from it. I bought one from a friend who took care of it like a baby. I had it a week and it seized up. No sludge at all in it with 90,000 miles.
They have a rubber gasket inside the timing cover that sometimes breaks off/rots and falls into the pan and you lose oil pressure. Engine becomes toast...
I pulled the pan and found remnants of a broken rubber o-ring in my pan. I forget where it went, but once it comes out, you lose oil pressure.