I'll second what mctmatt said - that forum is a wealth of good knowledge. I'm a member there, and found it incredibly useful when it came to working on my Mercury Sable.
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In the past decade, I have had both a 2001 Taurus with the Vulcan, and a 2003 Sable (the Merc version of the Taurus) with the Duratec. Both cars were very solid cars.
I'd probably still have the '01 Taurus if it hadn't been totaled.
I bought the 03 Sable with just over 75,000 miles on it, in 2009, and sold it with a little over 189,000 miles on it, in 2014. For about the first 3 years I had it, I was pretty bad about maintenance, and while I got the oil changed, etc.. when it was needed, it wasn't nearly often enough.
The car didn't seem to care, at least not that much. Sure, there were the occasional issue like suspension or brakes that went past their useful life.. but they still got fixed/replaced.
Other than that, no major issues, but the car definitely was neglected.
Eventually, I got my head straight and got back on top of maintenance.. even started doing most of the maintenance myself. This was definitely a learning experience.
Overall, I'd say that the Duratec 3.0 engine is a great engine, but I will agree that it's definitely not the easiest engine to work on. It's shoehorned in there pretty tight.
Between the Duratec and the Vulcan, I prefer the Duratec overall - More power, better torque..
On to your questions:
Originally Posted By: SumpChump
1. Gas Cap evap check engine code
The obvious fix here is get a new gas cap. You can test this by replacing the gas cap, clearing the code, and driving around for about 15-30 minutes. If that fixed it, the code won't come back.
On my Sable, it ended up being the intake manifold. The (plastic) intake manifold did develop a tiny crack in it at one point (around 140,000 miles)which ended up causing a code, but replacing it only took a few hours and wasn't expensive.
Originally Posted By: SumpChump
2. Slight slight clunk at steering radius center when turning the steering wheel at parking lot crawl speed.
Never had this on mine.. not sure what it would be, off the top of my head.
Originally Posted By: SumpChump
3. slight brake shimmy when braking firmly at highway speed
I DID have this happen on mine. One of the brake rotors had developed a "hot spot" on it.. uneven material density. I replaced the rotors with new ones, and the shimmy went completely away and never came back.
Originally Posted By: SumpChump
4. Oil pan beneath is "moist" with oil (simply age?) not oily anywhere past that.
Yes, the Duratec has a tendency to leak oil, but it's manageable. Mine started around 130,000 miles, leaking from the valve cover gasket(s) and making its way down the engine. The Oil pan ultimately was pretty covered with it. I was able to almost completely stop this after a while by switching to Valvoline MaxLife oil and adding a little Trans Fluid to the oil. It was down to just a couple drips a week.
As part of the process to address this issue, I cleaned the engine and pan as much as possible. Made it easy to trace the leak and monitor any changes.
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Bottom line, as far as this Taurus - $3000 is not a bad price.. not awesome, but not bad. If it were me, I'd try to negotiate it down to $2500, or maybe even a little less.
For comparison sake, My sable was the LS Premium (Leather, MACH sound system, chrome wheels, etc.. and when I sold it in October of 2014, with 189,000 miles on it, I got $3000. The one you're looking appears to be a lower trim level, so it should really sell for less.