Interesting stuff on this thread.
I just bought a 2007 Lincoln MKX with 146k. The car is immaculate, purrs like a kitten, and runs, shifts perfect. Well, almost.
The day I bought it, I had my mechanic change all of the fluids. The Transfer case (PTU) had a grey creamy sludge on the fill plug.
I took it for a drive about 60 miles each way, and noticed a burning oil smell when I got out of the car. I opened the hood after a minute or two, and didn't see any smoke or anything. On the way home, I stopped and immediately opened the hood and saw a tiny bit of smoke come up from behind the engine for about a half second and stop.
I noticed small drops of black oil where I parked it, about the size of a quarter. The wierd thing is, I checked the driveway of the woman I bought it from, and it was totally clean.
It seems to shift and drive fine at all speeds.
After reading this post, I am wondering if just flushing it a few times would do the trick, or if I should have the seals replaced, or go right for the new transfer case (PTU). I imagine this car has already had the case replaced, since they seem to go out at 60-90k.
Jlkansascity, did yours leak from the seals, or out the vent? I am hoping I can squeek out having to buy a new PTU.
Any advice would be appreciated.