A friend of mine who has a 2012 SRT received this notice from Dodge: "The manufacturer recommends the use of a full synthetic SAE 0w-40 engine oil or equivalent...the user guide and tip card for your vehicle VIN xxxxxxxxxxxxx incorrectly stated the use of SAE 5w-40 engine oil instead of the correct oil which is SAE 0w-40 full synthetic engine oil." Apparently, they are going back to the old Mobil 1 days.