I looked at new challenger today with the v6 3.5. I was surprised to see on the oil filler cap 10/30w. I thought that 10/30 in a new car was a thing of the past. I guess I am wrong.
The 2.7 v6 in my car calls for 5w-20 for my 2005 Stratus, just for reference. Now I'll be on a search to see what the different Dodge V6 engine requires for oil.