I wouldn't recommend it. Also, the EcoDiesel requires a certain SPEC oil (Can't remember off the top of my head). I wouldn't chance it all together. Just buy enough for a full change. 10.5 qts is the capacity.
Thanks, found the article after and posted:
http://www.ecodieselram.com/forum/threads/ram-steering-wheel-wiring-harness-recall-r36.442/
Welcome to the site @RedsunBC