I am a dealer as well but have extensively discussed the requirements of our engine to their experts and they do not have an oil that fully fits the bill so I have not changed the SRT over. They claim they are working on it as Dodge has many vehicles now requiring the 0W-40. I was told I could "get away" with their 5W rather than 0W but with this being a very close tolerence design, I chose not to go that route.

Their oil is superior in my opinion but the weight thing concerns me.