Nothing, other than regular maintenance I.E. oil and transmission fluids changed.
This is my first car; my parents purchased it for me from an elderly couple who gave up driving due to their age. Due to the low kms., it was in like new condition. It has been extrememly reliable so far, and I have had no problems whatsoever. The engine has plenty of power when necessary, and the ride is very comfortable. The fit and finish could be better, but it is a 14 year old car (I.E. dash rattles, squeaks, some door trim falling off inside, etc) and thus I'm not really expecting a whole lot. Excellent value for the money.
I had a 1988 Dynasty with really low miles and the same engine. Watch for low oil pressure or the oil and water pump wearing out, mine went completely without warning and the engine seized up because it got so overheated. It's just a good idea to keep an eye on the temp and oil pressure gauges anyway. Good luck with yours though.