Our 2001 Caravan with a 3.8L now has 179,000 miles on it. What would people's opinion be on replacing the injector O-rings as part of preventive maintenance?
We plan to keep the van for a least another couple of years so I'm just trying to stay ahead of things. I just replaced both O2 sensors yesterday and I'm sure my arms will heal from all of the cuts in anther week.

 

injector O-Ring? why would you? if it ain't broken, leave it as is.
Maintainence is all in ur book. Tune up, trans service, clean throttle body, oil change. Thats all you really need.