Re: the right fluid to use Forum › Forums › Re: the right fluid to use September 2, 2011 at 8:06 am #33129 Carl DarnellParticipant Offline Hmm, I have been running 30wt non detergent engine oil in my 2000 NT254 for over 800 hrs now with no problems. The important thing is to keep the oil level at the full mark.