Welcome to the site.
With the 2.7L engine I would switch to a full syntetic oil like mobil1.
But, you need to do it carefully, since you don't want to dislodge big chunks of sludge that maybe in the engine.
I would recommend 2 oil changes at 1500 mile apart, with a semi syntetic, like casteroil, and then switch over to the full syntetic, mobil1.
Change it ever 3000-4000 miles max(even though syntetics can run to 6000, I wouldn't recommend it with the 2.7L).
Since it's a 2001 2.7L egine most of the orgional 98 2.8L engine problems have been corrected, so you should have a goood 2.7L. I don't know what corrections they made each year on that 2.7L. But most of them , I think, were done between 98-01, then a couple more in 02, and from there I don't know if they did any more.
You may only need to add a couple of parts to that engine, if you want, to bring it up to date with all of the corrections needed.
The most inportat thing is making sure you change the oil and getting it cchanged over to a full synthetic soon.
So just do the oil changes and you should be fine, for the most part.
A cooling system flush would be good, plus a differential fluid change and transmission fliud and filter change, and then a flush(first do a transmission and filter change, then the flush). Make sure they use ATF-4(not ATF-3), for the transmission fluid.
That's my advice.
I am sure there are other maintenance checks , etc., that you may also need to do with a car over 100000. Transmissions in dodges and chryslers seam to go at about 150000, I believe, unless you take precautions to save them.
So that's just a heads up to look out for.
Good luck and hope to see you here for a while with a good running car.
If you want to do some mods, there are plenty of people here to help you too.
Last edited by 98concorde2.7L; 10-08-2005 at 04:42 AM.