Check out the report on oil at this site which may help you determine what is best for your vehicle(s).

It is long but contains a considerable amount of information most of us didn't know before.

 

Unfortunately, the JAG site doesn't have your 1997 model at this location, but my 2003 shows this -



I can presume it should be applicable to your year as well. I know different engine, that's why I am only somewhat confident.