I had a dealership here in Florida put 5/30 in my 2020 bighorn 5.7. The did drain and put in 5/20 but they said according to their info they could run 5/30? They suggested I run 5/30 because of the heat in Florida? I showed them the owners manual and told them to look at the oil cap. What do you guys think? Has anyone else had this experience?? Next oil change the same thing happened. So apparently they are putting 5/30 in every hemi that comes in for an oil change. I reiterate now 5/20 when dropping off my vehicle!! When I made an appointment they could not find my name because they changed it to MR 5/20 in their computer