Welcome James!
Check out our maintenance section, we've got plenty of good info around oils and other peoples experiences:
https://www.ecodieselram.com/forum/forums/ecodiesel-maintenance.29/
Did you follow this article or something different?
https://www.ecodieselram.com/forum/threads/transmission-pan-filter-replace.1496/post-12470
The article is attached in that post.
I've fixed that.. I'm the only one who moderates at this time and sometimes it's hard for me to get on super early.. you early birds beat me here in the mornings!
SOMETHING has to change to comply with emissions regulations.. and most would assume fuel economy and/or power would suffer or it would've been right in the first place during the initial testing/development.
Could be the sending unit, or the entire tank. Perhaps just keep filling the tank on a routine/schedule so you don't run out. Especially if you're out of warranty as that entire replacement would be costly.
Welcome! Just have a read around the forums and educate yourself.. plenty of good, plenty of bad. Be sure to share some pictures or start a "garage" for your truck here: https://www.ecodieselram.com/forum/garage/