Slowmover, I like your CTD Ideology. Your truck is fortunte to have you as it's owner. It should last a very long time & you live in Texas? Two life times at least.
Do you use a by-pass oil filter of any kind? I picked up a used one on ebay for a good price. Are you on the Mopar Man 1973 site? One of my favorites, he's on all the Dodge Cummins pages checkin' things out too.
Doin' fine w/ a 5.9,
Dave