1997 Dodge Caravan

My wife and I have a 1997 Dodge Caravan 3.0L.(217023)km. We purchased it at a dealers and have done alot on it. I was wondering if its OK to switch from regular oil to synthetic oil. Would that harm the engine?
I have done full Tune up, transmission flush, antifreeze flush, replaced timing belt, new air con belt, breaks, all season tires, oil changes, Fuel injector service. And I guess soon a altenator replacement.

Have I have everything I should do?
October 24, 2007.

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