Update: I cancelled the order for the Gates after reading some bad reviews and bought the Motorcraft. Gates used to be good stuff. Now even their t-stats are junk.
Thanks to all who replied!
I've been reading the additives start breaking down at 6 months. I'm retired and don't drive much. I use Kirkland oil and do it every six months. I use to go 5k miles and never had any problems. I get bored, so I don't mind doing it.
I've looked at some older posts, but I'm still not sure what to do. I'm replacing the original water pump on my 96 Explorer 4.0 with a Gates WP from Rock Auto. It looks like a paper/fiber-type gasket, and in the description it says, "The no-sealant-required gasket allows for fast, easy...