I have the 1996 PA with basically the same exact engine, 3.8 L. If I use the recommedned filter for it, the Fram PH3387A (Which I would NOT recommend), or any of the other compatible 3387A oil filters, I would put in 4.5 quarts to be exact where it needs to be. I don't think one pint exta in there is in jeporday of any problems, as it has been done on countless thousands of vehicles over the years.
I don't ues the 3387A filter series though, I use the longer filter known as the 3980 and it's equivalent. Mobil 1 makes a great filter as does K&N but I would not put a Fram on my old beater pickup. I'd rather use, and they are not bad either, the Wal-Mart brand of oil filter. Again, I use the longer filter, the 3980 and it's equivalent. It has the same central threads, same oil gasket and is in all respects the same, except for the length. THEN, I can use 5 quarts and it comes up exact.
I don't use Mobil1 synthetic oil as I feel Amsoil is better.
http://www.oilsandlube.com/they_say_...rforms_mob.htm
Mobil1 makes a very good oil, but I prefer others, but would use Mobil1 any day over any conventional Dino oil.