The oil I use, I get because of a good value from my supplier. It states dexos1 standard, but is not on the "official" list. I never worried about it. For both my 2013 1500 and now my 2015 2500. No one ever seems to ask, and I just play dumb. Just as in dealing with law enforcement, one should never go around divulging too much information to the dealer. If there is a problem, they are required to do the leg work to prove that you messed things up. And most any oil that claims it meets dexos1 standards probably does. For the the folks who make the oil, they have to deal with legal litigation, Federal Trade Commission hassles, and a host of other problems. Not wise to put out a product that claims it meets the standard when it doesn't. That being said, I have confidence that the oil I use will be just fine. The company has been in the lube business longer than anyone in N.America, so I think they know what they are doing. Each of us has different comfort levels. If you only sleep well at night knowing the oil you put in is on the approved list, then that is a safe bet.