my inlaws have a 1991 and a 1992. The 91 has a 3.4 DOHC and the 92 has the 3.1.
The 91 has 213,000 miles and still runs as strong as the day they bought it.
The 92 has 198,000 miles and the only problem they have had out of it is the fuel pump, but that is wear and tear.
These vehicles have been to Utah SEVERAL times and West Virgina probably 15 times in the last year. We live in Southern Indiana. I wouldn't think twice about driving cross country in a Lumina. I would trust my father in law's before I would trust my 98 Venture.
Normal maintanance is the key here. Has it been Maintained?