Originally Posted By: SteveSRT8
Originally Posted By: Johnny248
Even though it says use only 5w20?? There is some sort of warning that using anything else can cause problems with the MDS.
This is baloney! I have been a new gen hemi owner since August 05 and have had two different mds equipped 5.7's in my stable. Plus I mod at one of the biggest 300 forums on the net with thousands of mds owners.
It is not harmed in any way by heavier oils. Even 20w-50 for years. It simply changes the mds characteristics and activation parameters.
Altered a bit but never harmed. Run whatever grade you want, but don't let anyone kid you. It's a big old loose american v8 with some fancy tech in the valvetrain.
Well, at least for the winter I am going to run the 0w20 (because it calls for 20w, and also because I have a case of it in my garage) lol and prob due a UOA in the spring, and then I might switch to the 0w30 in the summer since I also have it on the shelf.
Steve, what are you running in your 300?